15 minutes - 1 hour
My back camera stopped working. My battery was dying a little quickly, so I swapped that out while I was performing surgery.
Repair was easier than I expected, especially putting everything back together. Took about an hour. The hardest parts were separating the screen and getting the battery out. By hardest I mean they were the most seemingly sketchy parts.
My only complaint is that the camera quality is not was good as the original camera. This is actually a pretty big deal to me. I am going to look for a better camera and try to swap it out again.
Putting things back together wasn't as hard as I thought it would be. Take your time with the glass. When putting the main board back in, make sure everything that is supposed to be under is is under and everything that is supposed to be above it is above.