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Theoretically, you could leave a Mac turned on all the time, and leave it turned on forever. How Long Can a Mac Be Left Turned On For? You can learn more about uptime and getting boot history here, focused on the command line approach, it applies to all versions of OS X and all Mac hardware. You will see something like the following reported back:ġ0:17 up 10 days, 11:02, 4 users, load averages: 0.34 0.29 0.24Īs you can see, this Mac has been turned on and running for 10 days and 11 hours and 2 minutes.Īll Macs will report different data here of course, because some people turn off their Macs at night, and some people don’t (I never do). This command will report back your systems uptime, which is telling you how long your Mac has been turned on for, or how long it has been since a reboot has occurred. Simply launch the Terminal and type the following command into the command line to discover exactly how long the computer has been on: Locate “Time since boot” to see the amount of time it has been since the Mac has been turned onĪ command line approach is also possible.Select “Software” from the side menu list.From anywhere in OS X, hit Command + Spacebar and type “System Information” followed by the Return key to launch that app (some earlier versions of OS X call this “System Profiler”).The easiest way to see how long it has been since your Mac was last off or booted is to use System Profiler. Find How Long a Mac Has Been Turned On For with System Information in OS X

Macos years used runonly to avoid