How long until I get my iPhone back?

I'm sending my iPhone in to get fixed to have the power button fixed, and I'm wondering how long until I get it back? And I keep hearing people say they got their phones replaced instead of fixed, but i'm 14 and I don't have anymore money for a screen protector and I just want to know if it will be fixed or replaced.

Well if you took your phone to apple they just replace it I have apple care plus ANSI had to pay $50 for a new one anyways

With a warranty and never jailbroke you will get a referbished iphone in 10-14 days.
you never get your original iphone back

Most phones are returned in a week. Depending on how serious the fix is.
Usually, the power button is no big deal.
A screen protector is meant to keep you from scratching your screen. Normally, the buttons have nothing to do with the protector.

Why do so many even use the power button? I never turn my iphone off ever (when I want it quiet I just flip the mute switch at the top corner).