Speed to lead: how fast should you call a new inbound lead?

Call a new inbound lead within 5 minutes of the form fill, and treat 1 hour as the outer limit. Speed to lead is the time from submission to the first call attempt, and the two studies most teams quote both found that the odds of reaching and qualifying a lead fall steeply within the first hour. Both studies have limits, so measure your own numbers too.

What the two speed-to-lead studies found

Lead response time has 2 widely quoted studies, and they share an author, James Oldroyd. Here they are side by side.

	InsideSales.com/MIT study	HBR study
Published	Presented 16 Oct 2007 at a MarketingSherpa B2B summit	Harvard Business Review, March 2011
Authors	Dave Elkington (InsideSales.com CEO) and James Oldroyd (then a faculty fellow at MIT)	James B. Oldroyd, Kristina McElheran and David Elkington
Data	3 years of data from 6 companies on the InsideSales.com system: more than 15,000 web leads and 100,000 call attempts	An audit of 2,241 US companies with a test web lead, plus 1.25 million leads at 29 B2C and 13 B2B US companies
Main finding	Odds of contact 100 times higher, and odds of qualifying 21 times higher, when called within 5 minutes than at 30 minutes	Firms that tried to call within an hour were nearly 7 times as likely to qualify the lead as firms that tried an hour later, and more than 60 times as likely as firms that waited 24 hours or longer

The 2007 study also reported that from 5 to 10 minutes the odds of contact fell 5 times and the odds of qualifying fell 4 times. In the first hour, contact odds fell more than 10 times. It defined a contact as a call that reached a live person and lasted a set time, from 2 to 6 minutes depending on the company, and let each company define a qualified lead.

The HBR audit showed how slow most firms were. 37% responded within an hour, 16% within 1 to 24 hours, 24% took more than 24 hours, and 23% never responded. Among firms that answered within 30 days, the average response time was 42 hours. HBR defined a qualified lead as a meaningful conversation with a key decision maker.

What the studies cannot tell you

Read the multipliers as a direction, not a forecast for your team.

• Neither study measured revenue. The 2007 study says it “did not address close ratios”. The 21 times figure is about qualification, not closed deals.
• They are observational. Both compare leads that happened to be called at different speeds. Fast teams may differ from slow teams in other ways, such as better lists or more reps.
• The 2007 data came from one vendor’s platform and 6 companies, and was presented at an industry summit.
• The definitions vary. A contact lasted 2 to 6 minutes depending on the company, and each company set its own bar for a qualified lead.
• They are old. They were published in 2007 and 2011, and buyers’ phone habits have changed since then.

The direction has held across both studies: the first hour matters most. The size of the effect for your leads is something only your own data can show.

What “within 5 minutes” means in practice

Write down how you measure speed to lead before you set a target.

• Start the clock at the form timestamp, not when the lead reaches the CRM or when a rep opens it. Leads that sit in a queue still count.
• Stop the clock at the first call attempt, not the first conversation. The 2007 study tracked “first dial attempt time” and “first contact time” as separate points.
• Report the median and the share called within 5 minutes, not the average. An average hides the spread: in the HBR audit, 37% of firms responded within an hour, yet the average was 42 hours.
• Handle leads that arrive after hours. In the US, telephone solicitations to residential subscribers are allowed only from 8 a.m. to 9 p.m. at the called person’s location (47 CFR 64.1200(c)(1)). Measure these leads from the start of the next calling window, and see legal calling hours by country for other markets.

How to call new leads within 5 minutes

1. Route leads the moment they arrive. HBR named 3 reasons for slow follow-up: pulling leads from the CRM daily instead of continuously, sales teams focused on finding their own leads, and routing rules based on geography and “fairness”.
2. Alert one named rep, with a fallback. If the rep does not start the call within 2 minutes, route the lead to the next free rep.
3. Put new leads at the top of the queue, ahead of cold lists, during every call block.
4. Show the form answers before the call: the page, the request and the source, so the rep can open with the reason they called.
5. Plan the next attempts. The 2007 study found contact odds fell more than 10 times in the first hour, and that after 20 hours each extra dial was linked to lower odds of contact. Make the first hour your heaviest calling time for each lead.
6. Review it weekly. Track the share of leads called within 5 minutes and the contact rate for 0-5, 5-30, 30-60 and 60+ minutes. Add both to your weekly SDR call metrics.

Where AI callbacks fit, and the consent they need

An AI voice agent can call a new lead seconds after the form fill, including evenings and weekends, as long as a calling window is open. That removes the queue. It also brings consent rules that a rep’s call does not.

In the US, the FCC’s declaratory ruling FCC 24-17 (released 8 Feb 2024) confirmed that AI-generated voices are an “artificial or prerecorded voice” under the TCPA. As of October 2026, under 47 CFR 64.1200:

• A sales call with an AI voice to a mobile or home number needs prior express written consent: a signed agreement, electronic signatures included, that authorizes calls using an artificial or prerecorded voice to that number.
• Every AI-voice call must state the name of the business at the start and give a phone number.
• Sales calls with an AI voice to those numbers must offer an automated opt-out within 2 seconds of that identification.
• A request to stop made in any reasonable way must be honored within a reasonable time, at most 10 business days.

A form that says only “contact me” may not cover an AI-voice call, so check its wording with your counsel. A common pattern: the AI agent calls leads whose form included that consent, and reps call the rest. Reps make cold calls; AI agents call people who agreed to it. For the full rules, see AI voice agent consent rules.

How DialSavvy handles this

DialSavvy Agents are in early access: we build your first agent with you. For speed to lead, an agent will call new leads who asked to hear from you, as soon as they ask, and hand the call to a free rep with a brief. Checks for AI-voice consent before an agent dials are coming. On the DialSavvy dialer, reps get a brief before every dial, and checks run before every call for calling hours in the contact’s time zone and your do-not-call list. See DialSavvy Agents.

This week, export 4 weeks of leads, calculate the minutes from form to first call for each one, and compare the contact rate of leads called within 5 minutes with the rest.