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i'm gonna guess there's too many variables to say that you'll have X hours left. for example, i turn wifi off unless i'm actively downloading/updating my libraries. when reading, i use night-mode (white text on black background) all the time. those two alone probably change drastically how much life i can get out of a full charge compared to another user's scenario.
but absolute max would be 10 days if my "10% loss per 24hr on standby" is a nice constant. but then you're not actually using the device, so... that's irrelevant.
the biggest drain is always the screen. depending on what the main display content / color is (black, white, mid-tone), that'll have the largest effect on how many hours of actual use you get from the device.
no idea on an app or widget that would tell you how much time is left. the way i use my units i get more than enough time to get through a day, and just charge it at night.
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