How Long Should I Keep Rogaine On My Head?

I have heard different lengths of time you should keep Rogaine on your scalp prior to washing. Ive heard from 4hrs to 20 mins. What time period should Rogaine be kept on scalp before I can wash it off?

You should be washing your scalp before you put on Rogaine. If you wash your scalp after applying it, you’re just washing the medication off. Read the instructions that are included with Rogaine for the full details, but in brief, it should be applied twice a day and left on the scalp until it dries.