I get about 20 hours on a Sage. Maybe a bit more. Native reader as KOReader is too clunky with 8000+ ebooks and I fix ebooks as I add them to Calibre. BT, Wifi & front light off.
The Clara B&W is almost 1/2 the area of screen:
Quote:
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*A single charge on the eReader lasts up to 53 days, based on 30 minutes of reading per day with the front light at 10% brightness and WiFi and Bluetooth® wireless technology off.
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https://uk.kobobooks.com/products/ko...mpaign=ClaraBW
That's about 26 to 27 hours.