How long does it take for iPhone 4 to die?

I left my phone at school in my locker and it has 10% of battery right now ( I checked on the find my iPhone app) anyways, I have my alarm on and I'm waiting for it to die how long do you think it will take? Do you think it will die before 5:30am? Its 7:36pm here right now. Cause I don't wanna get in trouble…

It probably will die by 4:30am

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  • How long for an iphone 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?