1 - 4 Stunden
The battery was dead, and we didn't want to buy a new IPod Touch just cause of that...
It was perfect! The only "difficult" part was the soldering. But it was pretty easy in fact. No worries about that!
Just do it! It's much more cheaper than buying a new IPod Touch, and if you really can't do that, that's not a problem. At least you can say that you've tried it!