i always leave my seed plants under 24/0 lighting until they show sex naturally(preflowers)usually 4-6weeks. this also gives them time to mature(alternating nodes) before flowering. that's just me though. i'm in no hurry. if i was i would not grow mj. good luck with whatever method you use. 1 more thing every time i have ever grown a batch of seeds the best plant in the bunch is ALWAYS male. to top that i just grew out a 12 pack of Bogglegum seeds 2 months ago and got all males!! imagine that!!! i don't meen to make you nervous or anything...i'm just venting!