I do not think it matters really. I think that there may be four lengths of each nipple, S, L, LL and the number without a suffix, it being the nominal length.
As long as it’s length does not get in the way you are golden. Obviously if it is too long it may look ugly.
I would like one of the pressure bleeders, but at the price they are here - no way. I have tried the vacuum type but I saw micro bubbles from air entering around the thread. Stopping the leak seemed a pain in the you know what. So I pump the pedal with Speed Bleeders.