30 Minuten - 2 Stunden
Shutter won't open when using camera, thus useless. Also any related app: instagram, Flashlight, MagLight won't work
Very well. Even though, I never had to work with tiny little screws like that before...
The new camera works fine. Except after a few days, the shutter didn't open again, even after restarting iOS several times. And the next day it worked again.
So I think maybe the problem is elsewhere and it will eventually break down again...
Patience and focus