20 - 30 Minuten
Phone was bent and then left in a South Texas Car in the middle of summer. The battery was so swollen it pushed the screen out of the case. Replaced the battery and everything is back to normal.
My 16 year old performed the surgery in 1 hour!
If you have bad eyesight either grab a magnifying glass or do as I did and let you 16 year old do it!