Photo period plants can stay in VEG mode as long as we keep the lights on above 15/16 hours. You determine when you want to flip based on criteria:
Is it in a pot, how big is the pot, how big is the plant. We do not want 10lbs in a 5lb bag, understand?
More root = more fruit
Stretch - as plants move into flower, expect stretch at a minimum of 1 foot, a maximum of 3 feet
Stress - make sure you have enough space to insure the lights are no closer than 12-18 inches. You either have to train (bend) of have room to raise the lights and keep a canopy so lower buds do not get light starved
Flower - expect 7-9 weeks of flower to maturity…you watch the trikes and nutrients (do not over feed, you can trigger them back into a more vegetative state). You will want to get the lights down to 12/12, start lowering temps at about 5 weeks, colder water for watering / feeding. Prepare of flush/dry stage, lights off 2 days…About a week in general