i dont even bother with the 36 or 48 hours of darkness between veg and flower i just gradually cut the hours back by 2. start at 20/4 for 1 week, 18/6 for 2 weeks, 16/8 for a week , 14/10 for a week then 12/12. 5 week veg. Usually with this i can get plants to sex in like 3-4 days.