It varies a lot for me. I was on a business trip and read quite diligently (around 2000 pages) for that two week period, and the battery was only half drained. During normal use though, I don't get more than about 1000 page turns.
My wife has one too and gets around 1500 page turns per charge. Both of us read only books bought from the Sony store, don't use any kind of memory expansion card, and don't have any music loaded on the device (not even the music originally included).
My guess is that power up/down takes more power than a normal page turn does.
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