Quick answer: The best time to follow up with a lead is within one minute of the enquiry, then again at 30–60 minutes and 1–2 hours, with later attempts on roughly days 5, 14 and 15 and about six calls in total (Velocify, leads from 2012). Each attempt should also sit inside the legal calling window: for US telephone solicitations, 8am–9pm at the called party’s location under federal rules (8pm in Florida); for Australian telemarketing calls, 9am–8pm on weekdays and 9am–5pm on Saturdays.
That answer comes from three original studies and two calling-hours rules, and all three studies are old. Harvard Business Review published its lead-response research in March 2011. James Oldroyd (then at MIT) and InsideSales.com first presented the Lead Response Management study in October 2007. Velocify’s “Ultimate Contact Strategy” deck analysed leads generated in the first half of 2012. We did not find a newer study with a published methodology that we could open and verify, as at 24 October 2026. So the honest position is that the direction of these findings has held up, and their exact multipliers should be treated as a decade-old snapshot. In the US, the calling-hours limit comes from the TCPA rule at 47 CFR 64.1200 and the FTC’s Telemarketing Sales Rule. In Australia it comes from the ACMA’s Telemarketing and Research Calls Industry Standard 2017, which applies whether or not a number is on the Do Not Call Register.
“When should I follow up with a lead?” is really three questions: how fast to make the first response, what time of day and day of the week to call, and when to make attempts two to six and then stop. This page answers each one from the original study, not from the blog posts that re-quote it.
How fast should I follow up with a new lead?
Fast enough that the lead is still at the screen where they enquired. Each of the three original studies measured something different, and that difference matters more than the headline multiplier. HBR measured qualification within the first hour. The 2007 study measured contact and qualification odds in five-minute slices. Velocify measured conversion by how quickly the first call was placed. They agree on direction: every one of them finds the first hour, and especially the first few minutes, is where most of the value sits.
The quotable version: a lead called within five minutes is not a slightly better lead than one called in thirty; in the 2007 Lead Response Management data, the odds of qualifying it were 21 times higher.
| First response | What the original study measured | Study, year and sample | What to do |
|---|---|---|---|
| Within 1 minute | A first call placed within a minute of the lead being generated: 391% improvement in lead conversion rate (the deck’s Figure 1; its baseline is not defined on the slide). The 0–1 minute first call carried +156% higher conversion in its call-timing chart. | Velocify, “The Ultimate Contact Strategy”, uploaded by Velocify to SlideShare in September 2013; about 3.5 million leads from more than 400 Velocify client companies, generated January–June 2012. The 391% figure is attributed to “recent Velocify research”, not necessarily the same dataset. | Make the first call automatic. A human queue cannot hit one minute at 7.55pm. |
| Within 5 minutes | Odds of contacting a lead called in 5 minutes rather than 30 minutes: 100 times higher. Odds of qualifying it: 21 times higher. From 5 to 10 minutes, qualification odds fell 4 times. | Lead Response Management study, James Oldroyd (MIT) with InsideSales.com, presented 16 October 2007; three years of data from six companies, more than 15,000 leads and more than 100,000 call attempts. Did not measure close rates. | Treat five minutes as the outer limit for the first attempt during calling hours. |
| Within 1 hour | Firms that tried to contact a lead within an hour were nearly 7 times as likely to qualify it as firms that tried an hour later. In the 2007 study, contact odds fell more than 10 times and qualification odds more than 6 times across the first hour. | HBR, “The Short Life of Online Sales Leads”, March 2011; 1.25 million leads at 29 B2C and 13 B2B US companies (years not stated). Plus the 2007 study above. | If the first call missed, the second attempt belongs inside this hour (see the timing table below). |
| After 20 hours | Every additional dial after 20 hours reduced the chance of making contact to qualify the lead. | Lead Response Management study, 2007 (as above). | Change channel or slow down; do not keep redialling on a fixed loop. |
| 24 hours or more | Firms that tried within an hour were more than 60 times as likely to qualify the lead as firms that waited 24 hours or longer. In HBR’s audit of 2,241 US companies, 24% took more than 24 hours and 23% never responded. | HBR, March 2011 (as above). Audit average response time: 42 hours, among companies that responded within 30 days. | A lead this old is a reactivation, not a follow-up. Open with a reason to talk, not “just checking in”. |
We go deeper on the first-response problem itself, and why an SLA alone rarely fixes it, in our guide to speed to lead with AI agents. This page assumes you have accepted the first-minute target and moves on to the parts most guides skip: the clock, the calendar and the stopping point.
Where Zian fits
Zian AI fits the part of this schedule that people cannot keep: answering an enquiry the moment it arrives, at any hour, and landing attempts two to six in the right slots without anyone having to remember them. Its SmartReach AI™ orchestrates message, channel and timing by country, industry and profile with intelligent follow-up pacing, and teams on the platform have seen a 926% increase in follow-ups and 28x more contact attempts.
That matters for this page because the timing table below is easy to agree with and hard to run by hand. An AI receptionist answers inbound calls 24/7, so the lead who rings at 9.40pm is answered, qualified and booked rather than sent to voicemail. When the lead enquires by form, the agents follow up by voice call, SMS, email, WhatsApp, Instagram DMs and Facebook Messenger, and handle answering machines and voicemail on the calls they place. PrecisionPitch AI™ then split-tests scripts and approaches against real outcomes, which is how you find out whether the 2007 time-of-day findings hold for your own market. Zian is in a partnership-application beta; each of its three listed plans, including Intel + Widgets (Free Forever), starts with a partnership application. Whatever runs your cadence, write the legal calling windows in as hard rules and test them.
What is the best time of day to call a lead?
On the only original study that measured it, late afternoon was best for reaching a lead, and early morning and late afternoon were best for qualifying one. The 2007 Lead Response Management study analysed web-form leads that were called at least once, using call records from the InsideSales.com system.
- Best for contact: 4–6pm, which was 114% better than 11am–12pm, just before lunch, the worst block for contact.
- Best for qualification: 8–9am and 4–5pm. The 8–9am block was 164% better than 1–2pm, the worst time of the day.
- Best for both: 4–5pm was 109% better than 11am–12pm for contacting a lead in order to qualify it.
- What was left out: the study excluded 7–8am and after 6pm because the authors did not treat them as standard working hours. It does not tell you whether 7pm works.
Three limits apply before you rebuild a roster around these numbers. The data came from six companies, so it reflects their industries and their callers. The published summary does not say which time zone the hour blocks use, so it cannot be read as “the lead’s local time” with certainty. And the authors wrote that response time “dwarfed” both the day-of-week and time-of-day effects. A lead that arrives at 1.15pm should be called at 1.16pm, not held for the 4pm block.
Time of day is a scheduling rule for attempts you can choose the timing of, not a reason to delay the first call.
The 8–9am slot does not exist in Australia
Here is where the 2007 finding meets the law. In Australia, telemarketing calls may not be made on a weekday before 9am under section 8 of the Telecommunications (Telemarketing and Research Calls) Industry Standard 2017. So one of the two best qualification blocks in the study is unavailable for an Australian telemarketing call unless the account-holder (or their nominee) has given express consent in advance to that particular call at that time. In the US, 8–9am sits inside the 8am–9pm window. The late-afternoon blocks (4–6pm for contact, 4–5pm for qualifying) are legal in both countries on weekdays, which makes late afternoon the time the study and both rulebooks agree on.
What is the best day of the week to follow up?
Wednesday and Thursday, on the same 2007 data. Thursday was 49.7% better than Tuesday, the worst day, for making contact. Wednesday was 24.9% better than Friday, the worst day, for qualifying. Thursday was 19.1% better than Friday for contacting a lead in order to qualify it. Monday was poor in every category, and Friday was reasonable for reaching people but weak for qualifying them.
Read that as a tie-breaker. If you have a follow-up that can go on Wednesday or Monday, choose Wednesday. If a lead arrives on Monday, call it on Monday. The spread between best and worst day (19.1% to 49.7%) is real, but it is small next to a 21-fold change in qualification odds between five and thirty minutes.
When should I make follow-up attempts two to six?
On a schedule that is dense on day one and sparse after it. Velocify’s 2013 deck compared conversion for leads contacted on each call attempt across every possible time period, then published the slot that performed best for each attempt. The deck also recommends emails between calls, because leads that were sent email had a 16% higher chance of being reached by phone.
The follow-up timing table. Each slot is the deck’s best-performing window for that attempt; the percentage is the deck’s “higher conversion” figure for that slot. The legal note is what limits the slot in practice. Days are counted as the deck counts them: day 1 is the day of the enquiry.
| Attempt | When (after the enquiry) | Channel | Evidence source | Legal window note |
|---|---|---|---|---|
| Call 1 | 0–1 minute | Phone | Velocify 2013: +156% higher conversion; 2007 LRM study: 5 vs 30 minutes = 21x qualification odds | Only if the enquiry arrives inside the window. Otherwise queue it for the window opening (US 8am; Australia 9am, Monday to Saturday) and acknowledge by message now. |
| Email 1 | About 20 minutes | Velocify 2013: +49% | The calling-hours standard in Australia covers voice calls; email falls under separate rules. | |
| Call 2 | 30–60 minutes | Phone | Velocify 2013: +58%; the best of all half-hour periods for a second attempt | Same window. A 7.40pm weekday enquiry in Sydney leaves 20 minutes: room for call 1, not call 2. On a Saturday after 5pm, neither. |
| Call 3 | 1–2 hours | Phone | Velocify 2013: +25% | Same window. In Florida, three commercial telephone solicitation calls in 24 hours on the same subject is the cap, so call 3 is the last that day there. |
| Email 2 | Day 4 | Velocify 2013: +85% | No calling-hours rule; consent and unsubscribe rules still apply. | |
| Call 4 | Day 5 | Phone | Velocify 2013: +22% | Prefer 4–5pm on a Wednesday or Thursday if the day can move (2007 study). Not on an Australian Sunday or national public holiday. |
| Email 3 | Day 8 | Velocify 2013: +52% | As email 2. | |
| Call 5 and email 4 | Day 14 | Phone and email | Velocify 2013: call +23%, email +37% (call-5 day read from the deck’s combined timeline; the call-chart label is partly illegible in the archived copy) | As call 4. |
| Call 6 | Day 15 | Phone | Velocify 2013: +9% | As call 4. After this, the deck judges that reaching the remaining 7% of converters with seven or more calls is “probably not worth the cost”. |
| Email 5 | Day 22 | Velocify 2013: +44% | Last email before contact; more than five lowered conversion by 36%. |
The deck reports that calling at the recommended times gave an average conversion gain of 49%, emailing at the recommended times 53%, and the combination 128%. Those are Velocify’s own figures from its own client base, in a document that ends by recommending its own software, and its authors wrote that the study “reflects an aggregate of hundreds of organizations across many different types of industries” and may not be optimal for an individual business. Use it as a starting schedule, then measure.
The two studies disagree about persistence, and the disagreement is useful
The 2007 study found that after 20 hours, every additional dial hurt the chance of making contact to qualify the lead. Velocify’s 2012 data found calls on days 5, 14 and 15 still converted better in those slots than in others. Both can be true. The 2007 finding is about repeated dialling, the habit of calling the same lead again and again on day two and three. The Velocify schedule spaces calls days apart and fills the gaps with email. The practical reading is the same in both: after the first day, slow down and change channel.
When should I stop following up with a lead?
After about six calls and five emails without contact, or immediately when the lead asks you to stop. The numbers behind that, from Velocify’s 2012 dataset:
- 93% of converted leads were first reached by the sixth call attempt, so only 7% were reached on attempt seven or later.
- Leads that took seven or more calls to reach were 45% less likely to convert than leads reached in six or fewer.
- Leads sent more than five emails before contact converted 36% less often than leads reached after one to five.
- Most teams stop far too early, not too late: earlier Velocify research, quoted in the same deck, found 50% of leads were never called a second time.
Stopping at six calls is not giving up on the lead; it is moving it from an active cadence to a slower, value-led nurture where a seventh dial no longer costs you the relationship.
Legal stopping points come first. In Australia, the industry standard requires a caller to end a call immediately if the recipient asks or otherwise indicates they do not want it to continue, and in Florida the Telemarketing Act caps commercial telephone solicitation calls at three in 24 hours on the same subject from any number. Our article on AI follow-up pacing covers how to keep a lead warm once the active cadence ends.
Can I call a lead at 8pm or on a Sunday?
The best time is never outside the legal window, so the window sets the schedule and the studies only rank the slots inside it.
| Jurisdiction | Rule | Permitted window | Whose clock | Main conditions |
|---|---|---|---|---|
| United States (federal, FCC) | 47 CFR 64.1200(c)(1), TCPA rules | No telephone solicitation before 8am or after 9pm | Local time at the called party’s location | Applies to telephone solicitations to residential subscribers, and under 64.1200(e) to calls and texts to wireless numbers to the extent the FCC’s 2003 order describes. “Telephone solicitation” excludes calls made with the person’s prior express invitation or permission, to someone with an established business relationship, or by a tax-exempt nonprofit. |
| United States (federal, FTC) | 16 CFR 310.4(c), Telemarketing Sales Rule | 8am to 9pm | Local time at the called person’s location | Outbound telemarketing calls to a person’s residence without that person’s prior consent. Most business-to-business calls are exempt under 16 CFR 310.6(b)(7). |
| Florida | Florida Statutes s 501.616(6) | No commercial telephone solicitation call before 8am or after 8pm | Local time in the called person’s time zone | Applies to commercial telephone sellers and salespersons under the Florida Telemarketing Act, subject to its exemptions. “Commercial telephone solicitation” is defined in s 501.603 mainly as an unsolicited call to sell consumer goods or services, plus some calls that follow an advertisement, so a call the lead asked for may fall outside it; we apply the cap as the cautious default. Also caps calls at three per 24 hours on the same subject. |
| Australia | Telecommunications (Telemarketing and Research Calls) Industry Standard 2017, s 8 | Weekdays 9am–8pm; Saturdays 9am–5pm; no calls on Sundays or the seven national public holidays (and days given in lieu) | Usual residential address of the account-holder; under s 13, end the call if you learn the recipient is somewhere it is a prohibited time, unless they ask to continue | Covers telemarketing voice calls to Australian numbers, including calls made with a recorded or synthetic voice, even to numbers not on the Do Not Call Register. Exception: the account-holder or nominee gave express consent in advance to that particular call at that time. Research calls have different hours. State and territory laws may restrict other times. |
Two consequences for a follow-up schedule. First, an exclusion is not a reason to call late. A lead who filled in your form may sit outside the TCPA’s “telephone solicitation” definition, but the FTC rule, state laws and the lead’s own patience still apply, so 8am–9pm local is the safe default for US consumer leads. Second, in Australia the clock belongs to the account-holder’s home address, and a mobile number tells you nothing about which state that is. Our page on what to do when an AI agent calls someone at 9pm in Perth works through the time-zone arithmetic.
A worked example: one Saturday-evening lead, two countries
A consumer in Sydney submits your web form at 7.40pm on a Saturday. Here is how the timing table and the law combine.
- 7.40pm Saturday. The Saturday calling window closed at 5pm, so call 1 cannot go out. Send an acknowledgement by email or message straight away, and offer a booking link so the lead can choose a time.
- Sunday. No telemarketing calls in Australia. The 0–1 minute and 30–60 minute slots are gone; this lead is already outside the first hour that every study rewards.
- 9.00am Monday. First legal call. On the 2007 data Monday is the weakest day, but response time dwarfed day of week, so call at 9.00am, not Wednesday.
- Monday, 9.30am to 11am. Calls 2 and 3. The table’s 30–60 minute and 1–2 hour gaps were measured from the enquiry; here we apply the same gaps from the first legal call, which is our adaptation, not something the deck tested.
- Wednesday 4–5pm, then days 14 and 15. The deck counts the enquiry day as day 1, so call 4 on day 5 is a Wednesday for a Saturday enquiry, and it can take the late-afternoon block the 2007 study favoured. Calls 5 and 6 follow on days 14 and 15 (Friday, then Saturday before 5pm), with emails between.
The same form submitted at 7.40pm on a Saturday in Dallas leaves 80 minutes of the US 8am–9pm window: room for call 1, call 2 and the start of the call-3 slot. That difference, more than any time-of-day effect, is why a weekend enquiry in Australia so often ends up in the “never contacted” pile. The fix is not a better hour; it is answering the lead the moment they reach out on a channel that has no calling-hours limit, then booking them, which is what AI appointment setting is built to do.
How do I find the best follow-up time for my own leads?
Run the 2007 study on your own CRM. You need four timestamps per lead: created, first dial, first contact and first qualification (a booked meeting is a good proxy). Then:
- Bucket first-dial delay into 0–1, 1–5, 5–30, 30–60 minutes, 1–24 hours and 24 hours or more, and calculate the contact rate and qualification rate in each bucket.
- Bucket every dial by the lead’s local hour and weekday, and calculate the contact rate per dial in each block. Use the lead’s local time, which the 2007 summary does not specify.
- Count dials per lead before first contact, and find the attempt number after which almost no converted leads were first reached. Velocify’s answer was six; yours may differ.
- Drop every block that falls outside your legal window before you rank anything.
With a few thousand leads you will see the response-time curve clearly. Hour-of-day effects need much more data to separate from noise, which is one more reason to fix speed first.
Answer every lead while they are still on the page. Zian’s AI agents answer inbound calls 24/7 and follow up by voice, SMS, email, WhatsApp, Instagram and Facebook Messenger, with SmartReach AI™ pacing every attempt after the first. Apply For Partnership
Frequently asked questions
What is the best time to follow up with leads?
Within one minute of the enquiry, then at 30–60 minutes and 1–2 hours, with later calls around days 5, 14 and 15. That schedule comes from Velocify’s analysis of about 3.5 million leads generated in early 2012. Every attempt must also sit inside the legal calling window for the lead’s location.
Is the “call within 5 minutes” rule backed by a real study?
Yes. The Lead Response Management study by James Oldroyd of MIT and InsideSales.com, presented in October 2007, found that the odds of qualifying a lead called within 5 minutes were 21 times higher than at 30 minutes. It covered six companies and more than 15,000 leads, and it did not measure close rates, so treat it as old and directional.
What time of day is best to call sales leads?
In the 2007 study, 4–6pm was best for making contact, and 8–9am and 4–5pm were best for qualifying. The worst qualifying block was 1–2pm. In Australia the 8–9am block is outside the weekday telemarketing window, which opens at 9am.
How many times should I call a lead before giving up?
About six. Velocify found 93% of converted leads were first reached by the sixth call, and leads that needed seven or more calls were 45% less likely to convert. Stop at once if the person asks you to.
Can I call a lead after 8pm?
In the US, telephone solicitations are barred before 8am and after 9pm at the called party’s location under 47 CFR 64.1200, and Florida’s cut-off is 8pm. In Australia, weekday telemarketing calls end at 8pm and Saturday calls at 5pm, with none on Sundays or national public holidays.
Does the time-of-day finding still apply in 2026?
It is the only original day-and-time study we could open and verify, and it is from 2007. Its own authors found response time mattered far more than day or hour. Test the hour on your own data before relying on it.
Where every figure on this page comes from
| Figure | Who published it | Link | Date read |
|---|---|---|---|
| 2,241 US companies audited; 37% within 1 hour, 16% in 1–24 hours, 24% after 24 hours, 23% never; 42-hour average | Oldroyd, McElheran and Elkington, Harvard Business Review, March 2011 | hbr.org | 24 October 2026 |
| 1.25 million leads, 29 B2C and 13 B2B companies; nearly 7x within an hour; more than 60x vs 24 hours or longer | Harvard Business Review, March 2011 | hbr.org | 24 October 2026 |
| Six companies, three years, 15,000+ leads, 100,000+ call attempts; 100x contact and 21x qualification (5 vs 30 minutes); 4x (5 to 10 minutes); more than 10x and 6x across the first hour; 20-hour finding | Lead Response Management study, James Oldroyd (MIT) and InsideSales.com | archived copy of leadresponsemanagement.org, captured 8 November 2010 | 24 October 2026 |
| Wednesday/Thursday best; 49.7%, 24.9%, 19.1% day effects; 4–6pm (114%), 8–9am (164%), 4–5pm (109%) time effects | Lead Response Management study, as above | archived copy, captured 8 November 2010 | 24 October 2026 |
| Presented 16 October 2007 at the MarketingSherpa B2B Demand Generation Summit, Boston | leadresponsemanagement.org (InsideSales.com) | archived copy, captured 11 February 2010 | 24 October 2026 |
| 3.5 million leads, 400+ companies, January–June 2012; 391%; call-slot lifts (+156%, +58%, +25%, +22%, +23%, +9%); email-slot lifts (+49%, +85%, +52%, +37%, +44%); 93% by sixth call; 45%; 36%; 16%; 50% never called twice; 49%, 53%, 128% | Velocify, “The Ultimate Contact Strategy” (2013) | Velocify’s SlideShare upload | 24 October 2026 |
| 8am–9pm, called party’s location; wireless extension; telephone solicitation exclusions | US Federal Communications Commission, 47 CFR 64.1200 (eCFR, up to date as of 22 October 2026) | ecfr.gov | 24 October 2026 |
| 8am–9pm without prior consent; business-to-business exemption | US Federal Trade Commission, 16 CFR 310.4(c) and 310.6(b)(7) | 310.4, 310.6 | 24 October 2026 |
| 8am–8pm; three calls per 24 hours on the same subject | Florida Legislature, Florida Statutes s 501.616 (2025) | flsenate.gov | 24 October 2026 |
| Weekdays 9am–8pm, Saturdays 9am–5pm, no Sundays or seven national public holidays; account-holder’s address; consent exception | Australian Communications and Media Authority, Telecommunications (Telemarketing and Research Calls) Industry Standard 2017 (F2017L00323), s 8 | legislation.gov.au; Do Not Call Register industry standards page | 24 October 2026 |
| 926% increase in follow-ups; 28x more contact attempts | Zian AI (home page counters) | zian.ai home page counters | 24 October 2026 |
Stop losing leads to the clock. Zian’s AI agents answer inbound calls 24/7, set appointments and pace the follow-up across voice, SMS, email and WhatsApp. Zian is in a partnership-application beta. Apply For Partnership