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I've been running a test on mine, it's at 277.5 hours, which is 11.5 days, and it still showing 43% battery left. That puts it on pace for 486.8 hours, or 20 days. Note I have the brightness turned down to the minimum, the only thing running is the stopwatch, and I only check it a few times a day to make sure its still running, I am not using it for anything else.

If you don't use it at all, it looks like losing about 5% a day is a good rule of thumb, but since you need to not use it at all to get to this point, you'd be better off just leaving it turned off.

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Q: How Long will an iPhone 3GS last on airplane mode?
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