I recently upgraded to an iPhone 5.
The battery has usually gone by 2.00pm.
Eg today dd got hold of it. 25 minutes on Minecraft and it was down to 70%. 4 or 5 texts and a couple of weather websites, down to 50%. Unused after this, by 2:30 -3 it was gone. I'd hardly used it, and tried to keep it switched off. It's less than a week old!