When would I get my Braces off? (photos)

I haven't actually asked the reason why I got braces but I hope to ask my orthodontist at my next appointment. I have no gaps in my teeth but personally I think the reason is because my 4 upper front teeth were not straight and I had one odd bottom teeth ( as seen in the photos) . I got my braces on August 30th and I think there is major improvement as you can see ,especially on that bottom tooth . I wanted to know how long do you think it would take for my teeth to be straight completely ?

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