20 - 30 Minuten
iPhone would have to stay on the charger all the time otherwise it would randomly shut off if I used it to txt or make phone calls even if the battery meter was still ok.
Repair went great. Bought a battery from another company which did not take a charge. I then bought a battery from ifixit and the new battery works great!
Take your time on the battery replacement and if you follow directions it is not that difficult.