ROGAINE AFTER 12 HOURS REDDIT - DOES IT WORK?

Yo dudes, so I'm thinking on using Rogaine. Heard some stuff about it helping after just a couple hours, but that seems kinda wild, right? Anyone else try this hair growth serum and actually see changes in that time frame? Hit me up with your thoughts. List a few things I'm wondering: How much Rogaine do you gotta use? Does apply it to wet hair