title_body: What is the optimal length of time for pulling a shot of espresso?
upvoted_answer: That will completely depend on the blend of espresso you are using.  Different coffees will have different pull times.
  
  In my experience as a barista, you'll aim for about 28 seconds on most shots.  Some of the blends we've used aimed more at 25 to 31 seconds.
  
  TL;DR: Depends on the coffee.