2 - 5 minutos
My camera was getting blurry on my iPhone. The back of my iPhone has gotten scratches over time, but the most noticeable are on the camera area.
Extremely easy. Two screws....slide up, replace, two screws. That's it.
Do this repair if you need to. I'll probably upgrade my iPhone 4 whenever they release the 6th iteration, so this upgrade will hold me over fine until then.