20 - 40 Minuten
There was only sound on one ear when using the headphone jack. How did it happen no idea but it happened around 2 years ago.
Not very spectacular. I had some trouble removing the battery and, as always when I take anything apart, I had something left over after reassembling it but despite this it went very smooth and my 5 year old iPod works like new again.
Don't be afraid to use some force when removing the batter, the glue is pretty good.