How can I find out for how long OS X has been running after the reboot? Is it the kernel_task process' CPU Time value in Activity Monitor? If so, what format it is in? X:XX,XX? How sleep/hibernate affects the time value?


Open Terminal app and type uptime:

$ uptime
 12:01pm  up 2 days  3:52,  3 users,  load average: 3.37, 2.63, 2.31

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