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It's based on my experience with other electronic devices.
Take iPod Touch as an example. It can play music for 22 hours while active use of wi-fi gets you about 3-4 hours of battery life.
In the case of DR1000 the battery lasts for 4-5 hours while reading actively (i.e. chaning pages, not staring for hours while the device is in sleep mode). Using similar number relation (22/4 = 5,5 or 22/3 = 7,33) to the one mentioned above you can get a battery life in the range 41 min - 54 min.
Sure these are different technologies and different type of devices. That's why this is just a guess.
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