2 - 5 minutos
Just a modification of my iPhone 4. The clear back makes it a bit different than the 3 other iPhones in my house and is just cool.
Totally simple except, I didn't ever find the clear plastic cover for the camera lens that is shown in the video guide. I hope it isn't on the inside of the glass!
The screws are really tiny! I'd suggest a piece of tape with sticky side up to place them on. If you drop them you may never see them again!