Extraction theory- time The basics of espresso asks that a double shot be in the range of 25-35 secs. Note: Espresso standards are fairly undefined. While a long shot extends the brew time of the espresso, a double shot takes about the same amount of time as a regular shot to brew. It depends a bit on the recipe for the given coffee. For Quality control purposes, many coffee shops choose to only offer double shots, but … Below is Clive’s recommendation to ensure that you are as successful as possible, as quickly as possible. At 16 grams with the same grind in a double basket (this size dose allows the portafilter to fit into the machine pretty well), I get a 60ml extraction in 10 seconds. Solubles extracted from coffee beans include carbohydrates, lipids, melanoidins, acids, and caffeine.Proper brewing of coffee requires that the correct degree of extraction occurs. Since a double shot of espresso generally means double the quantity, so it can have around 120-140 mg of caffeine. Yield – the weight of espresso made. In my experience with most single shot baskets, a 9gr dose is simple too low to fill the basket and achieve even flow, so I recommend using somewhere between 10-11gr. In the case of too short extraction time (under-extraction) or too long extraction time (over-extraction) you might want to make a new espresso and/or check your grind size and dose. /*