5 - 30 minutos
The batteries in my phone and my daughter's phone were not holding a charge long enough to make it to the end of the day any longer. I could sent the phones back to Apple for replacement, but it was going to cost close to $100 each. Figured I would do it myself.
The repair was no big deal; however, one of the batteries was faulty and that threw me for a loop. Once I figured out the problem, I contacted ifixit and they replaced the battery right away.
Just take your time and don't get in a rush.