How long would an LCD repair take?

[Android Central Question]

So basically my phone fell off my desk last night and the screen is totally black. The LED notification lights still work so I suspect my phone is still working, but it seems the LCD is screwed up as the screen remains non-functional.

I am planning to go to a UBreakIFix in my area in a few hours. How long would it take them to repair the LCD? Would it take an hour or two or would it be considerably longer? I just would like to know due to having class this afternoon as well as ubering home, etc. Thanks.