How lond does it take for a frozen iphone to die?

My iPhone 4 froze yesterday around 5:00 pm and the battery was at 80% right now 5:00 and it still hasn't died. How much longer until it will die?

You can always smash it with a hammer if it doesn't die quickly enough to suit you.

Took me abt 24 hrs. If it doesn't die, try holding home and power button together for 15 sec, It should force shut down

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