How fast should you call back a missed call? What the research says

Call back within minutes if you can, and within the hour at the latest. The most cited research on response speed, published in Harvard Business Review in 2011, found that companies that tried to reach a lead within an hour were nearly seven times as likely to qualify it as companies that waited longer. That study measured web inquiries, not phone calls, so treat it as a strong direction rather than an exact number for your shop.

What the research actually measured

The study is "The Short Life of Online Sales Leads" by James Oldroyd, Kristina McElheran and David Elkington, in the March 2011 issue of Harvard Business Review. It has two parts.

An audit of response times. The authors sent a web test lead to 2,241 US companies and timed the replies. In the article's words, 37% responded within an hour, 16% within one to 24 hours, 24% took more than 24 hours, and 23% never responded at all. Among companies that replied within 30 days, the average response time was 42 hours. Source: Harvard Business Review, March 2011.

A study of 1.25 million leads. Using leads received by 29 B2C and 13 B2B companies in the US, the authors found that firms trying to contact a lead within an hour were "nearly seven times as likely to qualify the lead" as firms that tried even an hour later, and "more than 60 times as likely" as firms that waited 24 hours or longer. "Qualify" meant having a meaningful conversation with a decision maker. Source: Harvard Business Review, March 2011.

Why it applies to a missed phone call, with one caveat

A homeowner who fills in a web form and a homeowner who reaches your voicemail are in the same position: they asked for help and nobody has answered yet. If they have a leak or a dead furnace, they usually have other numbers to call. That is the mechanism the study describes, and it is why speed matters.

The caveat: the study didn't measure phone calls, plumbing or HVAC. Many articles quote other figures, such as a "first responder wins" percentage or a fixed number of minutes, without a traceable source. When you can't find the original study behind a number, don't build your process on it.

How many calls go unanswered in home services

Invoca, a call-tracking vendor, publishes benchmarks from calls on its own platform. Its 2026 home services report says that 52% of callers to home services businesses speak with a person, that the rate is 65% for calls over 15 seconds and 73% for calls over 30 seconds, and that answer rates vary across home services sub-industries from 32% to 74%. Its data covers sub-industries including HVAC and plumbing, within a dataset of over 70 million calls. Source: Invoca's Home Services Lead Conversion Benchmarks Report.

Keep in mind that this is vendor data, averaged across Invoca's own customers, and that "spoke with a person" includes calls that were never meant to be answered by a human. Your own call log is a better benchmark than any industry average.

Set a callback target your shop can actually meet

A research number is only useful if it turns into a rule someone follows. A simple version:

1. Pick a target. For example: every missed caller gets a call back within 15 minutes during business hours, and before 9 AM the next morning for after-hours calls.
2. Name who owns it. The office manager during the day, the on-call tech after hours. Without an owner, everyone assumes someone else called back.
3. Put new callers first. A caller who has never called before is more likely to be a new job than a customer checking on an appointment.
4. Measure it every week. Count the missed callers, how many were called back, and how long each one waited. A median callback time is more honest than an average, because one caller left until Monday drags the average up.
5. Fix the cause, not just the follow-up. If most misses happen at the same hour, the answer may be a second line, a schedule change or an answering service, not faster callbacks.

How to measure your current callback time

You need a call log that includes both incoming and outgoing calls. For each missed incoming call, find the first outgoing call to the same number after it, and record the gap. Our guide to exporting your call log covers where the export lives in the common phone systems, and the free missed-call audit does the matching in your browser, without uploading the file.

If you want the check to happen continuously, Herdback reads the call log from CallRail (Quo, Aircall and Ringover in beta) and emails you when a missed caller has waited longer than your target, 15 minutes by default. It doesn't call or text anyone for you, and it only sees callbacks made through the phone system: after calling back from a personal cell, you mark the caller as called back yourself.

Frequently asked questions

Is 5 minutes really better than 15?

The HBR study compared contact within an hour with later contact; it doesn't give a separate result for 5 versus 15 minutes. Faster is still better for the same reason: the caller is still looking for help and hasn't booked someone else yet.

Should I call back callers who didn't leave a voicemail?

Yes, as long as the number can be called back and isn't spam. Many callers hang up instead of leaving a message, and a hang-up is still a request for help.

Does texting back count as a callback?

A text tells the caller you saw the call. It doesn't book the job, answer their questions or tell you what they need. Use it as a bridge until someone calls, not as a replacement.

Sources

• https://hbr.org/2011/03/the-short-life-of-online-sales-leads
• https://www.invoca.com/reports/the-invoca-home-services-lead-conversion-benchmarks-report-2026