HT202824: OS X: Saving energy with Sleep
Learn about OS X: Saving energy with Sleep
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Helpful answers
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Jul 15, 2015 7:05 AM in response to Waleed amirby Averythomas,Check in System Preferences under energy saver. If you mean how long a mac can be asleep for is as long as it's plugged in.
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Jul 15, 2015 8:14 AM in response to Waleed amirby babowa,If you are not going to use it again for an extended period, then simply shut it down (I'd say a couple of days or longer) - I shut mine down every evening as I won't use it again for 24 hours. And, it does not need to be plugged in to sleep - if it's not, the battery will very slowly drain, so you would have to watch that.
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Jul 15, 2015 11:21 AM in response to Waleed amirby Tesserax,Basically indefinitely. If you are not logged in or your Mac is in sleep mode, it won't shut down.