1 - 3 horas
I could hardly hear anything from my iPhone 4s earpiece anymore.
My repair went great thanks to ifixit's very detailed instructions.
Keep your screws together with each step that you do. A screw tray would work great. I didn't have one so I used upside-down sticky notes and wrote which part of the phone the screws and parts came from. Put the screws on the sticky part of the note. Worked very well. Thanks ifixit!!!