title_body: When preparing a ristretto shot, should the brew time remain the same as a normale?
upvoted_answer: The time could absolutely stay the same for both your ristretto and normale shots. But - for that to happen your grind is certainly going to have to change, and obviously your yield (since you are now pulling a smaller / ristretto shot). 
  
  An example:
  If you pull a shot that's:
  
  20g in | 25s | 20g out
  
  And then you decide to pull a larger/normale shot, but you want to keep the time constant. Then you are basically forced to loosen your grind to a coarser grind size.
  Then you could pull your normale at: 
  
  20g in | 25s | 30g out
  
  Hopefully that answers your question!