Only the trichomes will tell you when to harvest PPP. You canā??t use calendar every plant is just a bit different. You do understand it takes about a week to 10-days for the plant to switch from vegetation cycle to flower cycle. Thatā??s why you donā??t start using flower nutrients in the first week of changing the lights to 12/12. The large node spacing is from not enough light penetrating the canopy. Be patience and it will catch up the buds will fill in and grow nugs for you. The fan leaves do not look that big so the temperature must be under control now, good job.