20 - 30 Minuten
I accidentally put my iphone on the washing machine and I thought it was dead soaked, but after 3 days on rice and a dehumidifier it worked, but it shut down every 15 minutes. So I read some reviews and people said that it could be fixed changing the battery.
What it took me the most time was finding the sucking plastic. After that it was so easy!
It took me like 16 minutes, really fast, and believe me I haven't done anything microchippy, so I had no experience.
I am keeping the magnetic screw puller. Forgive my english, I am not an english speaker.
I put down a paper and wrote down different numbers corresponding to the screws I was removing, cause I read that was something someone later regretted not doing.