5 - 30 minutos
After drying the phone in rice for about 2 days we could turn the phone on, but then after 60-90 seconds, the screen would go blank and the phone would turn off. When we would plug the phone in, it would use wall power, but not charge and then still shut off, so I figured it was a battery problem and decided to try and replace it.
Went smooth, followed the guide on this website, no problems and it worked perfectly the first time. Replacing the pentalobe screws was very straight forward and could be done easily by almost anyone. Overall took about 5 minutes.
Try replacing the better yourself if your phone gets dropped in the water since it voids warranty anyway.