How do I get my record exspunged and how long do I have 2 wait

If you are in the US, and if your state within the US allows records to be expunged and if your judge will allow it, normally you will wait about 8 years and you will hire an attorney who will make a motion to the court, they will show how you have not had any other arrests, how you improved your education or you had steady work history and other positive info