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In my experience with my working Nook ST, it'll discharge about 2-2.5% charge per day left in on, in standby mode. It will also discharge about 1% per hour reading. So in an average day, I generally read about 1hr, so I generally lose about 3% charge per day. If I don't use it at all, it'll still lose about 2% per day.
I have also found that when I charge it to 100%, for whatever reason, I generally lose about 3-4% charge overnight (I generally charge it in the evening) even if I don't use it, but it "steadies" at about 96% charge after than and only uses 2% per day in standby, 1% per hour reading.
I've also found, even using a wall adaptor, if it is drained to the point of shutting off, it takes a good 30-40 minutes on the wall adaptor charging before it allows itself to power on, probably longer on just a computer USB port. So the 15 minute message is very inaccurate.
For total battery life, my one experience running it from a full charge to 19% before charging I got a little over 30 days of use out of it. I think roughly 35 days, reading probably about 75 minutes a day on average over that period. Since the thing is rated at 30 minutes a day for 60 days, I'd say that is pretty decent.
If I read more in a day I get more hours of reading. If I did a "cram" session where I sit down and read for 8-12hrs in a day (sadly, with 3 young children that hasn't happened in years) I could probably get 70-80hrs of reading in before the battery was flat is my guess over 5-7 days, but because it discharges in standby some, I normally am getting about 40hrs or so of reading over about a month, which is still pretty good (my ipad 2 discharges less in standby than my Nook ST seems to, though the iPad 2's battery is 4.5x larger, but I might get 13-14hrs of reading on my iPad 2 if I am lucky and have the screen brightness at my normal setting, which is about 30% brightness and that is with 4.5x the battery capacity of the nook ST).
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