How fast should you call a new lead?
Within about 5 minutes, according to the widely cited MIT/InsideSales research. Contact odds fall sharply, and qualification odds fall further, the longer you wait.
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The short answer
- A study attributed to MIT and InsideSales.com analyzed over 15,000 leads and more than 100,000 dials. Contacting a lead within 5 minutes rather than 30 changed the odds of making contact by roughly 100 times, and of qualifying the lead by roughly 21 times.
- A separate 2011 Harvard Business Review analysis of over 2,000 US firms found a 42-hour average response time, with 23% of firms never responding. Firms that responded within an hour were nearly 7 times more likely to qualify the lead.
- People often mix up the two studies online, and the 100x/21x figures are sometimes wrongly credited to Harvard. They measure related but different things, and both point the same way: a faster response converts better.
- Five minutes is a strong general target backed by real research. The studies aren't a promise for every industry, so track your own team's response time against what converts to get a sharper number.
Why the gap between 5 minutes and even 30 minutes is so large
The core finding is attributed to a joint MIT and InsideSales.com analysis of over 15,000 leads and more than 100,000 dials across six companies. Contacting a lead within 5 minutes rather than 30 changed the odds of reaching them at all by roughly 100 times, and the odds of qualifying them by roughly 21 times. The reason is simple. A lead who just sent a form is at their peak of attention and interest, and often still comparing options. That window closes fast once their attention moves on.
A separate and often confused data point comes from a 2011 Harvard Business Review analysis of over 2,000 US firms. The real-world average response time was 42 hours. 23% of firms never responded to a lead at all. Firms that responded within the first hour were nearly 7 times more likely to qualify the lead than those that responded later. The two studies are often cited together and sometimes mixed up. The 100x/21x figures are often wrongly credited to Harvard, but they trace to the MIT/InsideSales analysis. Both reach the same point from different angles: most businesses respond far slower than they should, and you can measure what that gap costs.
What the research found
| Study | Key finding |
|---|---|
| MIT / InsideSales.com (2007), 15,000+ leads, 100,000+ dials, 6 companies | 5-minute vs. 30-minute response: contact odds ~100x higher, qualification odds ~21x higher |
| Harvard Business Review (2011), 2,241 audited US firms | 42-hour average response time; 23% never responded; responding within 1 hour: ~7x more likely to qualify |
The 100x/21x figures are commonly, and incorrectly, attributed to Harvard Business Review; they trace to the MIT/InsideSales analysis. Verify sourcing before citing either figure.
What to do with this in practice
Treat 5 minutes as the target for a hot inbound lead: someone who just filled out a form or asked for a call. Measure your team's real response time against it. Most teams think they're faster than they are until they look at the numbers. If a live call within 5 minutes isn't realistic around the clock, an instant automatic reply closes some of the gap. It just confirms you got the request while a person sets up the follow-up.
Disclosure: SalesCrew is our product. Its speed-to-lead actions send an instant reply and assign the lead round-robin. Web forms and Calendly bookings arrive in one inbound channel, where the whole team can see and work them.
Do not confuse the two commonly cited studies
Questions
- Where does the five-minute figure come from?
- A study commonly credited to MIT and InsideSales.com. It analyzed tens of thousands of dials across several companies. It found steep drops in contact and qualify rates as response time grew from 5 to 30 minutes.
- Is a separate Harvard Business Review number the same study?
- No, and the two are often conflated. A 2011 Harvard Business Review analysis of over 2,000 US firms found a 42-hour average response time. It also found that responding within an hour made a firm nearly 7 times more likely to qualify a lead. That is a related but distinct finding from the MIT/InsideSales 5-minute figures.
- Does the five-minute target apply to every industry equally?
- Not exactly. The studies drew on a mix of industries and company sizes. Treat five minutes as a strong general target, not a number tested for your own field. Your own tracked data gives the sharper answer for your business.