24 hours is long enough for me, and unlike Eink, no annoying flash during page turns.
I'm finding I have to change battery's approximately once a week with JBL.
Regular Jetbook I had to charge a bit more often.
One thing that pushed me to switch from Jetbook to JBL is that
the Li-ion battery in Jetbook is listed for 3-500 duty cycles.
And costs 30$ to replace.
Where a set of rechargeable battery's for the JBL costs 13$, and lists 1,000 - 2000 duty cycles. And when the Jetbook needed charging I had to put it down and do something else for 4 hours. When the JBL runs dry its go swap the battery's, and 5 min later I'm reading again.
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