Bulk rise
How to tell when the bulk rise is done
The bulk rise is the first fermentation, before you divide the dough. You are looking for two things: a real increase in volume, and a dough that feels relaxed and slightly pillowy when you press it with a floured finger. If the indent springs back fast, it needs more time.
Time is a guide, not a rule. A warm kitchen speeds things up, a cold one slows them down, and a humid day changes the surface. The book tells you what to look for by feel, which matters more than any timer. Start checking early the first few times you bake.