I suspect that the majority of people who get up to 30 days on a single charge are probably only using the device for maybe the odd hour of reading most days.
If you're reading for 4-5 hours daily - I would personally class that as quite heavy usage.
I read for around 2-4 hours daily, use a bit of wifi and play the odd bit of music and the battery cycle tends to last around 10-12 days for me. I'm quite happy with that.
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