How long will it take for an overbite and a few teeth to move back to its own place with braces?

I've had braces before and once they went off I had to use retainers but I stop using them. It been three to four years I haven't had braces. But recently I had my wisdom teeth removed, the doctor told me to get retainers again or braces soon so my teeth won't get push out more. So I like to know how long it will take for my teeth to be straight and not have a overbite.

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