A landmark Harvard Business Review study timed how fast companies respond to people who ask for information. The results explain why so many “bad leads” are really just late replies, and they point to one of the cheapest growth levers in any business.
- What the researchers did
- What they found
- Why speed matters so much
- Why businesses are slow
- The 5-step speed-to-lead playbook
- Scripts you can use today
- Mistakes to avoid
- How AI changes the maths
What the researchers did
In 2011, researchers James Oldroyd, Kristina McElheran and David Elkington published “The Short Life of Online Sales Leads” in Harvard Business Review. They approached the question from two angles.
First, they ran an audit. They submitted web enquiries to 2,241 US companies and simply timed how long it took each company to respond. Second, they analysed 1.25 million sales leads from 42 companies (29 business-to-consumer and 13 business-to-business) to see how response time affected the chance of having a real conversation with a decision maker.
That combination matters. The audit tells us how fast companies actually are. The lead analysis tells us what that speed is worth.
What they found
How fast 2,241 companies replied to a web lead
The headline finding is striking: companies that tried to contact a lead within an hour were nearly seven times as likely to qualify the lead (meaning they had a meaningful conversation with a key decision maker) as companies that waited even one hour longer. Compared with companies that waited 24 hours or more, they were more than 60 times as likely to qualify the lead.
Meanwhile, almost a quarter of companies never replied at all. Think about that from the buyer’s side: they raised their hand, filled in a form, and heard nothing.
Why speed matters so much
The study measured the effect rather than the psychology behind it, but anyone who has bought anything online can recognise what is happening:
- Intent is perishable. The moment someone fills in a form is the moment they care most. An hour later they are in a meeting, cooking dinner or talking to a competitor.
- The first reply frames the decision. Whoever responds first gets to ask the questions, set expectations and become the reference point every other option is compared against.
- Buyers shop in parallel. Most people enquire with several providers at once. Speed is often the first signal they use to judge who is organised and who actually wants the work.
Why businesses are slow
The researchers also noted why companies struggle to respond quickly. It is rarely laziness. Common causes included leads being pulled from CRM systems once a day rather than continuously, salespeople prioritising the leads they generated themselves, and lead-distribution rules (for example by territory or “fairness”) that add delay.
In smaller businesses we see the same pattern in different clothes: the founder is with a client, the enquiry lands in a shared inbox, nobody owns it, and by the time someone replies the next day the moment has gone.
The 5-step speed-to-lead playbook
- Measure reality. Submit your own website form, send a DM and leave a voicemail on a weekday afternoon and on a Sunday night. Time every reply. Most owners are surprised.
- Give every lead an owner. Every enquiry should have exactly one person or system responsible for the first reply. “Shared” usually means “nobody”.
- Automate the first touch. An instant, personal reply that acknowledges the request and asks one useful question keeps the conversation alive while you are busy.
- Make booking effortless. Offer two specific time slots or a booking link in the first message. Every extra step loses people.
- Follow up on a schedule. If there is no reply, follow up the same day, the next day and later in the week, across more than one channel. Then track response time as a weekly number.
Scripts you can use today
Instant reply (SMS, WhatsApp or email):
“Hi [Name], thanks for reaching out about [service]. Quick question so I can point you in the right direction: what’s the main thing you want to fix in the next 90 days? I have time on [day] at [time] or [time] if a quick call helps.”
Same-day follow-up:
“Hi [Name], just making sure this didn’t get buried. Happy to answer any questions by message if a call isn’t convenient.”
Day-three follow-up:
“Hi [Name], should I keep this open for you or close the file for now? Either is completely fine.”
Mistakes to avoid
- Sending a generic “we received your enquiry” email and nothing else
- Asking for a long form before you have even said hello
- Following up once and giving up
- Measuring lead volume but never measuring response time
- Letting leads from paid ads sit overnight while you keep paying for more
How AI changes the maths
When this study was published, replying within minutes at 2am meant hiring someone to sit by the phone. Today an AI agent can reply in seconds, in your tone of voice, ask your qualifying questions, offer real calendar slots and hand over to a human when needed. The research shows what speed is worth. AI makes that speed affordable for a business of any size.
That is exactly the problem the AI SDR inside our AI Growth System is designed to solve.
Key takeaways
- Speed is one of the cheapest growth levers available
- Replies within the first hour dramatically outperform slower ones
- Most delays come from process, not effort
- AI makes instant, personal replies affordable for any business
Source: J. Oldroyd, K. McElheran & D. Elkington, “The Short Life of Online Sales Leads,” Harvard Business Review, March 2011 (as summarised by SmartCompany, July 2011). This briefing summarises published third-party research for educational purposes. It is not original research by Aashish Maru. Statistics belong to their authors; our commentary is our own.