Did it die, or give you a low battery warning? Sometimes mine will give a false low battery warning, but go for hours more. I think there's an issue with the battery warning system that maybe has been updated. I'd say I get at least 12 hours out of a charge, maybe more.
If it did die within 6 hours of having a full charge, or even 8, I'd check the display settings and see if it's on constant bright or something.