How long should I wear braces even if my teeth aren't that crooked? (photos)

I just got my braces 1 week ago and my ortho didn't tell me how long I should wear it. My teeth aren't that crooked and I think it's only mild overcrowding and an overbite. It's weird but I love to have braces more than a year! What do you think? How long can I wear braces? And one more thing! Can I wear power chain too? I'm hoping for your response thanks! :)

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