I got my braces off in October..

I have a retainer too, and you really should be wearing it as much as possible. Once you get your braces off, your teeth are prone to wiggle and move around alot from being in braces so long. The retainer will prevent your teeth from moving around alot and shifting back to what your teeth were before pre-braces. Your teeth will not be able to move around alot when they are in the retainer, so this helps them settle into place. There is not an exact time that one day they will magically settle. It takes time, and constant retainer wearing. Be good, and wear your retainer as much as possible! Your orthodontist will tell you when your teeth are starting settle and they will be the one to let you know when you can stop wearing a retainer. Right now I'm at the stage where I only have to wear my retainer every night. Hope this helps :)