1 - 3 hours
Would not turn on.
Replaced power unit. Powers up and works. Every once I'm awhile when jostled slightly it shuts off still though.
Unplugging, removing battery and givin 10 minutes it will start again. No idea why.
Be methodical and don't rush this one. Its nearly a complete tear down. If one one follows the instructions and has a good set of T5-T10 drivers I think it's possible an 8 year old MIGHT be able to do it.