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I was able to drain Kindle DX Graphite to 64% (from 100% green-light-on type charge) in less than two hours, using text-to-speech at low volume, largest font size, most rapid speech rate.
The machine did not appear to enter sleep mode during the (unattended .. hooray) text-to-speech session.
For me, that completes the model of proper battery care for Kindle. My problem was being lazy about not catching it before a 100% full charge; if I can drain it down to a better storage level than 100%, I don't feel so bad about missing the exact time when I would rather have unplugged the charge cord (I like 80% here).
I try to shoot for 46% on a discharge curve, when doing this explicitly (as I've done here, using TTS as the workload the device is being asked to perform, so it's not just idling, sipping power at too conservative a rate to the purpose of draining it most rapidly).
I hit 64% this time; I'm okay with that. Much better than 100%, and I'll leave the device in plain sight, to remind me to try to get it closer to the mid 40 percentile, before zipping it away in its protective cover (to be forgotten for another 3 weeks as I enjoy my *other* Kindle .. whee).
Ymmv.
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