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.
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.
- The two studies are often conflated online. The 100x/21x figures are sometimes wrongly credited to Harvard. They measure related but different things, and both point the same way: faster response converts better.
- Five minutes is a strong general target grounded in real research. The studies are not guarantees for every industry. Tracking your own team's response time against conversion gives a more precise number for your business.
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 mechanism is simple. A lead who just submitted a form is at their highest point of attention and interest, often still comparing options. That window closes fast as their attention moves elsewhere.
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 routinely, and incorrectly, attributed to Harvard. They trace to the MIT/InsideSales analysis. Both point to the same conclusion from different angles: most businesses respond far slower than they should, and the cost of that gap is measurable.
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 requested a call. Measure your team's real response time against it. Most teams overestimate how fast they respond until they look at the numbers. If a live call within 5 minutes is not realistic around the clock, an immediate automated acknowledgment closes some of the gap. A simple confirmation that the request was received, while a human follow-up is arranged.
Disclosure: SalesCrew is our product. Speed-to-lead automation, such as automatic assignment and instant acknowledgment on inbound leads, is on our roadmap and not shipped today. This page describes the general research and target, not a SalesCrew feature available now.
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 dramatic drops in contact and qualification 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?
- The underlying studies drew from a mix of industries and company sizes. Treat five minutes as a strong general benchmark, not a number verified for your specific vertical. Your own tracked data is the more precise answer for your business.