How long is the iPhone 5 battery life?

I'm getting an iPhone 5 soon and want to know some facts about it. Please don't tell me that I should get a different phone because I will not get a non-apple product phone.

I have my iPhone 5 (had it since December 2012) and it depends on how much you use it. I got to high school so I charge it before I go to bed. And then I use my phone in the morning, lunch, and then after school. I don't really use it during class. I start school at 8:15 am and end at 3pm so by that time I have about 60%. Just charge it before you go to bed and when you wake-up just unplug it.

Apple claims that the iPhone 5 has enough battery power to offer "up to 8 hours of web browsing on a cellular connection, up to 8 hours of talk time, and up to 10 hours of video playback time" but your mileage may vary, depending on if you're a heavy user, such as if you do a lot of gaming.

It depends on how much you are going to use your phone
If you play a lot of music and videos, or use it for games and other things that use up memory, or keep it on for a very long time, the battery will drain quicker.
When you first get your phone, completely use up the battery to 1%, then charge it fully to 100%. Don't charge it unless it's very low because it defeats the purpose of charging

Its depend on how much you use it,

Battery back up-

Standby time - 225 hours
Talk time - 480 minutes
Music Playback time - 2400