How to Find out How Long Your Computer Has Been On

On Windows

1. 
   Open the Task Manager. You can do this in a few different ways:

   • Press Esc while you hold down ⇧ Shift+Ctrl.
   • Press Del while you hold down Alt+Ctrl, then click Task Manager.
   • Type "task manager" into the Start search bar, then click the Task Manager app at the top of the results.
2. 
   Click the Performance tab. It's at the top of the Task Manager window.
3. 
   Click the CPU tab. You'll find this option on the left side of the Task Manager window.

   • If you're using Windows 7 or down, skip this step.
4. 
   Find the "Up Time" heading. You'll see this in the bottom half of the Task Manager window.
5. 
   Look at the number right of the "Up Time" heading. This number, which will appear in DD:HH:MM:SS format, dictates the amount of time for which your computer has been on since you last turned it off.

   • For example, an Up Time value of "01:16:23:21" would mean your computer has been on for one day, sixteen hours, twenty-three minutes, and twenty-one seconds without shutting down.