There must be a reason for the rebound, either because the treatment plan was not perfect at that time, or because the wisdom teeth came out and pushed forward, or because the retainer was not worn for a long time, so it is possible to correct it again, but the time is hard to say. We won't know until your dental condition is finally determined. The general correction time varies from 1 to 3 years according to your age, depending on the complicated situation of your correction.