Why the first reply wins.
Someone fills in your form because they've got a problem right now. That itch fades in minutes.
Leave it an hour and you've probably missed them. By then they've pinged two or three other places, and someone's already called back.
Funny thing is, it's usually not about price. People go with whoever showed up first and made it easy. Everyone else gets a “thanks, we'll let you know”.
The full numbers are worse than you'd guess. They're in the speed-to-lead study. This page is about fixing it.