10 - 30 Minuten
I had my iPhone 4s in my pocket and fell into the pool while I was cleaning it. After that, as other users have described, the camera flash stayed dimly lit and the battery life was extremely short, but the phone worked fine. I tolerated this for a little while and then got an iPhone 6. My 10 year-old son was always a fan of my 4s and now it was his to keep but the battery life was awful.
I found fixit.com with a simple Google search. I surfed through it and decided to replace the rear camera and battery. For a little over 60 bucks I got the replacement parts and tools along with the liberation kit. I followed the instructions on the site and now my son has a functioning 4s!
Be very careful and deliberate while doing the repair. Make special places beforehand for all the little screws that have to come off. I'm almost 50 and I wish I had some magnifying spectacles or something to magnify the whole situation. Everything you are dealing with is extremely tiny.