   How do I use difftime?
  I want to use difftime so that I can measure a period of time. How does difftime work and how do I set it up?   
  Typing difftime into Google gets me an example right up front. Variations on that Google search get me more examples. So you’ll probably want to ask a more specific question, that shows awareness of the easily found resources out there.   ;  OK: Learned how to do it! Speedy Addition is complete   