Charge your psp fully, then goto your system information --> battery information.
It will tell you how long you have left.
Mine claims 6.5 hours, but it seems around 4 if im playing a game
Chat with our AI personalities
about an hour or so
it takes a total of 30 min to charge completely when you open the box
Yes, the chargers for each model are the same. It can charge a PSP 2000 or a 3000, etc.
Some firmwares allow the PSP to charge from a USB connection to a PC.
A PS3 will charge any device that can charge from a USB port. This includes, but is not limited to: PSP, Ipod, and many cell phones.