How long are you supposed to wait to wash your hair after you dye it.
I have never seen anything said about that in instructions. I always wash mine immediately after. There seems to be no problem.
It depends on the product you used, it should tell you. If you got it done professionally, your stylist should have mentioned it.To be safe, at least wait 24 hours.
About 25 min
Usually 24 hours. Although, if it's too dark, then washing it right away lightens it faster.
Half an hour
I always wait until the next day.
It should be on the instructions