title_body: How to keep the time before coffee get out of the machine?
upvoted_answer: Together with the first drop
  
  That 25 seconds we curved in our brains is mostly related to the speed of the extraction. Mostly, under normal circumstances, with a single spout portafilter for a single shot espresso, we expect to see 1 ml per second extracted coffee. At the end, you collect 25 ml's of coffee in your cup.
  
  So, I suggest you to count the time after you see the first drop.