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For all Kindles, not just the DX, they have a sleep mode. It automatically activates after the Kindle is idle for 10 minutes. Very little power is consumed while in sleep mode unless wireless is on, which it periodically checks for new downloads and updated content. If you turn wireless off and put Kindle to sleep, very little battery is used. Typical Kindle users do not turn the device on and off routinely; they just let it sleep. Waking up from sleep mode takes anywhere from 2 - 10 seconds; the latter is typical if you went to sleep with a Topaz-formatted book open as it takes longer to re-parse and display such books. Turning it completely off and then back on takes only a few seconds more. A full reboot takes a couple of minutes.
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