depends on the the user. whether you're light, moderate or heavy user. for mine, minimum can last 1 day. normally 1d 10 hours something like that. mine never last half a day.

like a lot of guys here said, it really depends on usage.  like mine OC to 1.3ghz, super heavy usage only last for 5 hours, if low usage can last at least 48 hours

super heavy means wifi + data on almost all the time and playing 3d games more than 3 hours, phone calls for 2 hour or so and some browsing or gps

low usage means no 3g data at all, only wifi for some browsing and only phone calls + sms only