How fast do you need to follow up on a buying signal?
Fast. The foundational lead-response research found that contacting a lead within 5 minutes versus 30 makes you about 100x more likely to reach them and about 21x more likely to qualify them, and responding within the first hour makes you about 7x more likely to qualify than waiting one more hour. Engagement signals decay the same way, so act while the context is still fresh.
Last reviewed: July 2026
What the speed-to-lead research says
This is one of the most-studied findings in sales, and it is remarkably consistent across two decades.
| Study | Finding |
|---|---|
| Lead Response Management, Oldroyd and InsideSales (2007) | Within 5 vs 30 minutes: about 100x more likely to connect, about 21x more likely to qualify |
| Harvard Business Review (2011) | Within 1 hour: about 7x more likely to qualify than waiting one more hour, 60x vs waiting a day |
| Velocify and Leads360 (about 2013) | Calling within the first minute lifts conversion odds 391%; the lift shrinks fast after that |
| Drift (2017) | Only 7% of companies respond within 5 minutes; 55% do not respond within 5 business days |
A note on a famous stat: the 391% figure is Velocify's, not from the InsideSales or HBR studies it is usually attributed to. We cite it correctly here.
Why intent decays
Attention is perishable. The moment right after someone engages is when your context is most relevant and your message most welcome. Wait a week and the person has moved on, the thread is cold, and you are just another stranger in the inbox. There is also a structural clock: buyers lock most of their shortlist early, often months before they talk to a seller (6sense, 2025). Late is often the same as excluded.
Signals and form-fills both decay
The research above is about inbound leads, but the logic applies directly to engagement signals. A comment on a relevant post is a soft inbound lead. The person told you, in public, that the topic matters to them right now. The freshness window is measured in hours and days, not weeks.
A practical response window
You will not always hit five minutes on a LinkedIn signal, and you do not need to. Aim to act within a day or two, while the context is still live and you can reference it naturally. The gap to beat is low: most teams are slow, so even same-day follow-up is an edge.
Slingapult's read: a warm signal has a short shelf life. The job of good tooling is to put the fresh ones in front of you while they are still warm, with the context ready, so following up quickly is the easy path rather than the heroic one.