20 - 30 minuten
Phone would randomly shut down and/or restart for no reason. Didn't seem to matter how much battery power was left. Sometimes 80% sometimes 45%. Sometimes it would restart on its on, other times would have to plug into power for it to restart and come back.
It was a little more difficult than I thought it would be. Had a great deal of trouble getting cable 3 back into the latch.
Take your time and try not to get frustrated.