ROGAINE AFTER 12 HOURS REDDIT - DOES IT WORK?

Yo dudes, so I'm thinking on using Rogaine. Heard some talk about it helping after just 12 hours, but that seems kinda sketchy, right? Anyone else try this hair growth serum and actually see something in that time frame? Hit me up with your experiences. Here's a few things I'm thinking about: What much Rogaine do you gotta use? Is it important