20 to 31 days for me.
I leave my Kindle WiFi on all the time and use sleep mode. I read about 2 hours per day. I play one MP3 song each day. I use the standard cover without a light sold by Amazon initially with the Kindle WiFi.
I got 20 days on my first charge and 31 days on my second charge. However, I did buy and download a 27.7 Mb Unabridged Matthew Henry Commentary which did require the K3 to be plugged into an outlet for 12 hours to index it while preventing undue battery drain.
If you keep adding a lot of large books like encyclopedias and dictionaries, your battery will be drained by that. The average book is only 1.5 Mb and usually indexes without appreciable battery drain.
So far I am 18 days into the third charge cycle and the battery meter still shows 4 bars.
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