I use the light most of the time (at 7 during the night and 37 during the day), on my first charge (note that the battery needs a bit of time to calibrate, though.) i got around 43h of reading (2 weeks for me), I'm on my 2nd charge now and I've read for 34h more or less and I've still got around 40% (again, in 2 weeks).
I don't turn it off, I only let it sleep and wifi is always off. I'm going to monitor this for a few charges but I think that around 50hours should be right..
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