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Most people just let it go to sleep and it can "sleep" for a week or more. I only turn wispernet on to download or search and then turn it off after I receive my download. The other thing you need to know is that the Kindle battery is not like a cell battery. You don't want to fully discharge it before you charge. I charge mine when it gets just below 50% but you should definately charge it before it gets below 20%.
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