I just got back from a 7 day cruise. The night before we left I charged up the PPW and turned on Flight Mode.
When I got home on Monday I checked the charge; still about 50%.
I was reading it probably two hours a day which is a lot more than I do at home. On Monday I read it for around 4hrs or so, given that I was stuck in an airport since 9am til our flight left at 2pm. And I continued to read on the flight.
It's now Thursday afternoon here and I've just put it on the charger, after it indicated somewhere below 50% on the battery symbol.
I think that I can live with that...