How long for an iphone 4 to die?

I left my phone in my school locker. Probably around 40%. I have my alarm set for 630 and i don't want it ringing in the morning at school… Will it be dead by overnight? How long does an iphone 4 to die in sleep mode? I have people texting me so the light is going on alot

Possible, but probably not likely without making phone call, surfing web, etc. I'm sure some will be used up with text, and any open apps, but probably will still be going off when you get there:/

3 hours i'm thinking. Since your not on it

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