The crop climbs fixed rungs. Phase I ferments raw straw. Phase II pasteurises it and clears ammonia. Spawning mixes in grain coated with mycelium. Spawn run is the 12 to 14 days in which mycelium fills the compost. Casing lays 3 to 4 cm of soil on top. Case run lets mycelium climb into that soil, about a week. Pinning is when the grower changes the room and pinheads appear. Cropping is the weeks of picking, in waves called flushes.
ICAR-DMR gives a duration for each rung but no single day count from spawning to last flush. Learn the ladder, not a total.