How long would I need braces for to fix my teeth? (Photo)

I was wondering how long it should take to make my teeth strait and get rid of the gap at the top and bottom of my teeth and the daw other gaps I also have air of an over or under bite (sorry I can't remember which one I think it's underbite) and I was also wondering it getting my teeth fix would also straiten my chin/jaw and if it would make my bottom and top teeth line up

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