Reply within the first hour
A study published in Harvard Business Review found that companies that tried to contact a lead within the first hour were nearly 7 times more likely to qualify them than those that did so an hour later, and more than 60 times more likely than those that waited 24 hours or more (HBR, 2011).
Recommendation. The first follow-up goes out automatically and within minutes. A team member steps in when there is clear intent.