How long has my Mac been on?
If you’re wondering how long your Mac has been turned on and running for, simply launch the Terminal and type the following command into the command line:
This command will report back your system uptime, telling you how long your Mac has been turned on. You will see something like the following:
10:17 up 10 days, 11:02, 4 users, load averages: 0.34 0.29 0.24
As you can see, this Mac has been running for 10 days and 11 hours and 2 minutes.