I don't have a Kindle but in my experience, when companies estimate the time the battery will last, they way underestimate it for the amount of reading that I do. It is completely about page-turns for the newer readers, at least.
I looked up the Kindle 3 on the mobile reads wiki and this is what it had to say about battery life:
Battery Life of Up to Two Months. A single charge lasts up to two months with wireless off (1/2 hour reading time per day). Up to 10 day battery life with wireless enabled
So, it sounds like you are getting the appropriate amount of use per charge.
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I looked up the Kindle 3 on the mobile reads wiki and this is what it had to say about battery life:
Battery Life of Up to Two Months. A single charge lasts up to two months with wireless off (1/2 hour reading time per day). Up to 10 day battery life with wireless enabled
So, it sounds like you are getting the appropriate amount of use per charge.