I like hours instead of days/weeks. Some weeks I'll read 20+ hours and others much less. On the amazon threads it seemed that people were getting 28 hours from real life usage. This wasn't very scientifically done, but since so many people were getting that number and it's in line with Amazon's 2 months at 30 min a day it's good enough for me.
Like schrodingerscat said, to do it right I'd like to see reading time, firmware version, page turns, font type and size, the same file being used, refresh times, age and serial number of the kindles, estimated number of recharges and at what level, and temperature.
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