I got 28 1/2 days off of my first battery charge (K3 Wi-Fi)
I keep wireless off all the time, unless needed. When I am done with the Kindle, I flick it off immediately, I don't wait for it to sleep. I read about 2-3 hours per day. I might have taken 1 or 2 days off there, but that's still pretty close to what Amazon claimed.
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