1 - 2 horas
My wife dropped her phone face down and SHATERED the screen.
The repair took about 2 hours being that it was my first time. Reassembly was difficult but I took my time and didn't rush and all was well.
My brother shared his insight AFTER I replaced the screen... Basically lay down some tape and stick the screws onto the tape as you go. Remove the screws in the exact order as listed in the instructions and you shouldn't have an issue confusing screws during reassembly.