I took two cycles and recorded reading session times for the Paperwhite 2013 in a spreadsheet leaving WiFi on all the time and a light setting of 15 out of 24. I got 13:29 in one cycle and 13:56 in another cycle. I charged when the PW message at 15% charge was issued.
However, now I turn WiFi off every night when I shut down my PC and don't turn it on until the first reading session.
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