How long would it take braces to pull short lateral and central incisors downwards and reduce buccal corridors?

I hate how small my teeth and smile are. I don't have much teeth show when my lips are resting or I make an expression other than smiling. I want my teeth to show a lot like models do, but even if it's not possible to pull the central ones down I want the lateral ones to be pulled down so my smile is little bigger. Central + lateral don't have to be even to each other, just longer. I also dislike how narrow my arch is and want to widen it. How long do these things typically take with braces?