I too found myself asking much the same question.* Guess it comes from reading too many threads.
Many posters talk about 30sec/30ml but very few mention number of doses/basket size. Discussion revolves around tamp, grind, grams per dose but make no mention of double/single.* Thats all perfectly acceptable but it leads to confusion amongst the half educated and we end up taking the wrong message.
Its always 30sec and its* "30ml per dose" (normale).
Aiming for 30/30 in a single cup with a double basket is somthing I mistakingly tried. Others will rightly wade in no doubt. Hopefuly they wont laugh too much.
If you want 30ml with the double use two cups under the pf.
Think of it as part of learning.
BTW I use both baskets. Singles can work.
And it dont know what 30/30 from double in single cup is called. Mini-ristretto ?[/edit]
sorry ... mini- doppio ristretto[/edit]