title_body: Single shot extraction time in Breville Barista Express
upvoted_answer: The problem seems like either in the dosage or in the tamping force or in the grind size.
  
  First, I advise you to use freshly roasted beans.
  
  I don't know what is the pressure value at 12 o'clock position, but I assume it is correct. Now, let's check what could have been happened.
  
  Either
  
  
  you have less coffee grounds so the water travels a short distance in the coffee
  
  
  or
  
  
  you tamp lightly so water channels through the coffee instead of extracting flavors from the grounds by pressure
  
  
  or 
  
  
  your grind is too coarse, so that water could travel faster through large boulders instead of finer sandy grounds with less extraction surface
  
  
  Therefore, I could suggest that you can first check your ground size, then check your tamping force (15 kg-f is more or less correct) and then the amount of ground you fill in the basket.
  
  Then, please see these relevant discussions:
  
  
  What are the standard espresso parameters (dose, mass/volume, time, etc.)?
  How to keep the time before coffee get out of the machine?
  How should I manage settings for single shot / double shot
  
  
  
  
  I have edited an enhanced answer based on @avacado1's comments. Thanks.