20 Minuten - 2 Stunden
He would ask almost daily why his tablet wouldn't charge and why tablets didn't use gas because batteries weren't as good.
Pretty simple. A few screws to remove the speakers and get them out of the way, and a few more screws to remove the charging port.
Videos for disassembling the Nexus 7 have you take EVERYTHING out before you even touch the speakers or I/O port. You don't have to touch anything other than the speakers and I/O port.