1 - 2 hours
Power button did not move, so iphone was still usable but battery discharged fast; annoying not able to shot the lit screen
Was not easy (supposed to be difficult anyway). But step by step and sometimes checking on the comments on page bottoms made the trip. I really appreciated the plastic table with all its little windows, so that rebuilding backwards was a pleasure.
Just that after having switched the old power button, which looked OK, for a new one, I had to further order the electronic sensor. Since I had to pay shipping twice, I wish there was a way to tell in advance which part is really broken.