I can get two solid days of heavy use on my iPhone 4. If I'm not using apps, I can get 3 days out of it. -=Geoskd
No you can't unless you're plugging it in. Maybe if you leave the screen off and turn off all network connections.
e-credibility: the non-guaranteeable likelihood that the electronic data you're seeing is genuine rather than somebody's made-up crap. - Karl Lehenbauer