I am often needing to add up a series to times in a document. This workflow makes it very easy. Clear the accumulator, select a time value, and hit your hotkey combination you assigned in this workflow. The time will be accumulated. You can show the time in Hr:min:sec format or just plain minutes. Have fun!
This clears the accumulator
ta:showmin Show the accumulated time in just minutes.
ta:showhr Show the accumulated time
There is a hotkey you need to set for adding the currently selected time.