How fast should you answer an inbound lead?
Within minutes during working hours, and never later than an hour. The strongest evidence is a 2011 Harvard Business Review study: companies that tried to reach a lead within an hour were nearly seven times as likely to qualify it as companies that waited just one hour longer. The same authors audited 2,241 US companies and found that 23% never answered at all. The famous "5-minute" numbers come from a different, older, vendor-run study. Use five minutes as your goal and one hour as your hard limit.
Updated
What does the research actually say?
Speed-to-lead stats get passed from blog to blog until nobody remembers where they started. We went back to the originals. Here's what each one measured.
| The claim you'll see | Where it comes from | What it measured | Use it? |
|---|---|---|---|
| "Respond within an hour and you're 7 times more likely to qualify the lead" | Oldroyd, McElheran and Elkington, Harvard Business Review, March 2011 | 1.25 million sales leads at 29 B2C and 13 B2B companies in the US. "Qualify" meant a meaningful conversation with a key decision maker. The comparison is contact attempts within an hour against attempts one hour later | Yes. It's the best public evidence, though it's from 2011 |
| "...and 60 times more likely than waiting a day" | Same HBR study | Same data: within an hour against 24 hours or longer | Yes, with the same caveat |
| "The average company takes 42 hours to respond" | Same HBR article, a separate audit | 2,241 US companies sent a test web lead. 37% answered within an hour, 16% within 1 to 24 hours, 24% took longer than 24 hours and 23% never answered. The 42 hours is the average among companies that answered within 30 days | Yes, as a picture of 2011. Don't call it today's average |
| "You're 100 times more likely to reach a lead in 5 minutes than in 30" | The Lead Response Management Study, 2007, by InsideSales.com with James Oldroyd | Three years of data from six companies: more than 15,000 leads and 100,000 call attempts. Phone calls to web leads. The study also reports a 21-times drop in the odds of qualifying | As direction only. It's a vendor-run study of six companies, and it's from 2007 |
| "HBR says respond in 5 minutes" | Nowhere | The HBR article's shortest window is one hour. Any 5-minute figure credited to HBR is a mix-up with the 2007 study | No |
Three things are worth saying plainly. First, all of this is old. We found no newer study of the same quality, so we cite what exists and date it. Second, the two studies are related: David Elkington, one of the HBR article's three authors, is named in the 2007 study as the CEO of InsideSales.com. Third, both show a correlation. Companies that answer fast may also be better at everything else. But we found no published evidence that waiting helps, and answering fast costs you very little.
So what's the target?
Our guidance, for a small team:
- Goal: 5 minutes during staffed hours. Not because a study proved five is magic, but because a goal of "an hour" becomes two hours in practice.
- Hard limit: 1 hour. This is the line the HBR data supports. A lead that waits longer than an hour during the working day is a process failure, and someone should hear about it.
- After hours: an instant, plain reply that says when a person will call and offers a way to book a time now. Then the first call at the start of the next working day, before anything else.
The reason speed matters isn't mysterious. Someone who just filled out your form is at their desk, thinking about the problem, with your tab still open. An hour later they're in a meeting about something else. By tomorrow they may have filled out a competitor's form too.
How fast are you today?
Measure before you fix. You need two timestamps per lead: when the form came in and when a human first tried to reach them. An auto-reply doesn't count.
Then report two numbers, and neither of them is the average:
- Median response time. The middle lead, not the mean.
- Share of leads answered within an hour.
Why not the average? One bad lead wrecks it.
Example (made-up numbers): five leads came in this week. You answered them in 4 minutes, 9 minutes, 22 minutes, 3 hours and 41 hours (that last one arrived Friday night).
- Average: (4 + 9 + 22 + 180 + 2,460) ÷ 5 = 535 minutes, or almost 9 hours.
- Median: 22 minutes.
- Within an hour: 3 of 5, or 60%.
The average says you're slow. The median says you're usually fast. The share within an hour says the truth: two leads in five waited too long, and you can see which two. That's the number to put on the wall.
Split it once more, by time of day. If every slow lead came in after 5 p.m. or on a weekend, you have a coverage gap, not a discipline problem.
How do you set this up on a small team?
You don't need a big stack. You need five decisions.
- One named owner per shift. Not "the team inbox." When a lead belongs to everybody, nobody picks it up. Write the name on a schedule.
- An alert that interrupts. A phone notification or a message in the channel the owner actually watches. A lead that lands in an email folder gets found at lunch.
- A backup after 10 minutes. If the owner hasn't touched it, it goes to a second person automatically. People get sick, take calls and go to lunch.
- A calendar on the thank-you page. The fastest response is letting the buyer book a time before you've done anything. Show your booking page right after the form is submitted.
- A first call with one job. Confirm what they need and book the real conversation. You are not doing discovery in the first three minutes.
Check whether the CRM you already pay for can route and alert before you buy anything new; see the best CRM for founder-led sales and what tools an SDR actually needs.
What do you say in the first call or reply?
Short. The lead already told you they're interested, so don't sell. Confirm and book.
By phone:
"Hi [name], it's [you] at [company]. You asked about [what the form said] a few minutes ago, so I figured I'd catch you while it's fresh. What made you look today?"
Let them talk for a minute. Then:
"That's exactly what we should go through properly. I have 30 minutes tomorrow at 11:00 or 3:30. Which is better?"
If they don't pick up, leave a 15-second voicemail and send this right away:
Hi [name], just tried you about your question on [topic]. Two options: grab a time here [link], or reply with a good time today and I'll call. Either way, a real person has your request.
After hours (automatic):
Thanks, we've got your request. [Name] will call you by 9:30 tomorrow morning. If you'd rather pick a time, here's the calendar: [link].
Name a person and a time in that auto-reply, then hit the time. A promise you keep is worth more than a fast robot. Once the real conversation is booked, see how to run a discovery call.
Does this apply to outbound replies too?
The studies above are about inbound web leads, so we can't hand you a number for cold email replies or callbacks. Our view: the logic is the same and the stakes are higher. A prospect who answers your cold email with "sure, tell me more" has given you a smaller signal than a form fill, and it fades just as fast. Answer positive replies the same working day, and inside the hour when you can. What counts as a positive reply is covered in reply rate vs positive reply rate vs meeting rate.
Sources
Pages accessed October 4, 2026.
- James B. Oldroyd, Kristina McElheran and David Elkington, "The Short Life of Online Sales Leads," Harvard Business Review (March 2011): https://hbr.org/2011/03/the-short-life-of-online-sales-leads
- InsideSales.com and James Oldroyd, "Lead Response Management Study" (2007), vendor-run study of six companies; read from a PDF copy of the original presentation: https://25649.fs1.hubspotusercontent-na2.net/hub/25649/file-13535879-pdf/docs/mit_study.pdf
- Targets, the measurement method, the setup list, scripts and the worked example: our own guidance and math; no outside source.