How long do you have to wait to get your license back after having it revoked?

That depends on the length of the period of revocation, and whether or not your state will allow consideration for early reinstatement or not. If your license is suspended/revoked, your state DMV needs to be contacted on this matter, at which point, they will either explain the terms to you, or else forward you to a hearing officer to make an appointment so that you can have a hearing for the consideration of early reinstatement of your license.