I am assuming that you are opening the cover because you are going to read. So lets redo your sentence without the cover. " i turn on the kindle to read 5 minutes. I turn off the kindle to go from from place A to B, 5 minutes later turn on the kindle again." In other words if you need to turn the kindle on and off to read frequently it doesn't really matter if you do it by pressing a button or opening a cover. I don't believe that turning on the device frequently will have any adverse affect on it but it doesn't matter since the alternative is for you to forego reading when you want to.
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