It doesn't really last for weeks persay, that's sort of a marketing ploy to lure customers in. The Amazon Paperwhite can last up to 8 weeks with a light setting of 10 and wireless disabled with a reading usage of a half an hour per day. This figure basically equates to 8 weeks = 56 days * 30 mins / 60 = 28 hours. If you read for 4 hours a day instead of 30 minutes, your device would only last at best, 7 days.
