I couldn't tell. But if he was using a double he'd be grinding finer and tamping more carefully. I typically make two types of coffee in a day: 1) A double basket for two single espressos 2) A double basket for a double ristretto Usually #1 turns out to be 2 single ristrettos, but I can live with that. So with a double basket for espresso I'm aiming for two single 30ml servings in about 27-30 secs and I'll adjust the grind accordingly. But if I'm just brewing for me, I'll adjust it tighter and try for just 30ml out of a double basket for my doppio ristretto. Same volume of ground coffee, different volumes of water. Which is why I can never get the volumetric buttons dialed in on my BZ07. The benefits of being able to single-dose grind!