1 - 2 hours
I drop my iPhone 4S manny times but nothing never really broken nothing in it. A couple of weeks ago I drop the phone at work (I'm a professional barber) and when I picked it up I was relieve until I turn the phone and the LCD screen was blanked. I didn't want to take it no were because I know it was going to cost a lot of money. I talk to one of my customer and he told me about ifixit. So I decide to take the challenge and go for it.
It was really frustrating at first and to make it worst on me the screen that I had order didn't slide but it turn on and off and the home button work but not the touch screen. I Call ifixit and and there customer service was really cool and with no questions ask sent me another one. I got it after 4 days and before I took the phone a part I check it and it work I was really happy and after taking the phone apart 4 times this was a pice of cake. Know my phone is black and white is really cool know.
Make sure you have patience and have experience on taking things apart and have the right tools. DO YOUR HOMEWORK and see at lease 2 or 3 different videos on how to take the phone apart
iPhone 4S LCD Screen and Digitizer
Phillips #00 Screwdriver
Flathead 3/32" or 2.5 mm Screwdriver
P2 Pentalobe Screwdriver iPhone