See How Long An Application Has Been Running

Using Microsoft’s PowerShell cmdlet: New-TimeSpan you can see how long an application has been running

Command:

New-TimeSpan -Start (get-process calc).StartTime

You will want to sub the word “calc” out for whatever application you are using. You can type “get-process” to see a list of all the ProcessNames running on the system.

For more examples, check out: https://technet.microsoft.com/en-us/library/Ee176916.aspx