In regards to a v2 or book edition, I've never seen 15 hours but your everybody's usage patterns are different.
From a full page pdf viewing perspective nothing beats the dr1000. The larger screen is absolutely fantastic for this type of reading and it will give you the closest to paper experience of any of the devices. The iLiad would be second for this type of reading, much better than the 6" screen devices, but still not in the same league as the dr.
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