10 - 30 minutos
My phone got some water inside of it, and I didn't notice any initial effects so I didn't put it in rice. Over the course of a month my phone would randomly shut off until it finally got to the point it wouldn't hold a charge.
It went great! Followed the descriptive manual and installed my new battery and my phone works great! Only thing though is I cannot connect to iTunes but it isn't a big deal at all.
Thanks ifixit for saving me $200!