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@HatBeard
rich how much liquid are you extracting from the coffee?
I use 18-19g in a double basket and extract between 22g and 27g of coffee depending on the coffee (lower end if it's a dark roast), aiming to get that amount out in between 25 and 40 seconds by varying the grind.
in terms of volume it's hard to say exactly how much that would be if pulled straight into a cup because of crema being quite variable but it's roughly about a single shot glass (not all the way to the brim though)
if you have scales but they don't fit under the grouphead/cup you can try weighing the shot after you've pulled it to get a rough idea of how much you are getting out.
but it's perfectly fine if you don't get any coffee out in the first 10-12 seconds if you're going for a slower shot, but if it goes on much longer than that without anything coming out you've choked the machine and need to reduce the dose slightly (given you're using pre-ground and cant change the grind instead)