45 minutes - 2 hours
Original battery only held charge for 10 minutes.
Repair went ok for first time ipod repair. Taking it apart wasn't bad. A bit more of a challenge putting it back together.
After repair, appeared that iPod was not working. Required reset after installing new battery. Flip Hold switch back and forth a couple times then press and hold Menu and Center button down at the same time for about 10 seconds.