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Amazon's estimates are based on 30 minutes of reading per day, with the light at 13.
From the Paperwhite's product page:
A single charge lasts up to six (6) weeks, based on a half hour of reading per day with wireless off and the light setting at 13. Battery life will vary based on light settings, wireless usage. Audible audiobook streaming over Bluetooth will reduce battery life.
Using their numbers, reasonable to expect 22-28 hours of useful battery life, depending on light setting and font size.
I wake up my Kindles numerous times over the course of a day, I use a large font, usually have the light all the way up unless the room is dark, and I read fast. So I get fewer hours on a charge than many other users. My current model Paperwhite has a good battery life, maybe 18-20 hours, my second gen Oasis gets maybe 15 hours. I leave the WiFi connected all the time, unless we are traveling. It makes syncing between devices work more dependably, and when reading non-fiction, I want access to Wiki.
I plug them in every 5 days or so, and don't pay much attention anymore to the battery life, unless I've downloaded a bunch of books, and I notice the battery being chewed up quickly.
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