Usually takes at least 3 weeks for them to start dropping pollen once put in 12/12. I wait until they are really close, then I remove the plant and put in another room as Far away as possible under an led flood light on 12/12. It doesn't take much light to keep the male alive and dropping pollen once he is close. When all the sacks start opening, I hold a baby food jar under them and shake the pollen into the jar, branch by branch. Leave the jar in a dark dry area for the pollen to dry(pick out all the plant matter first) for 2-3 days, add desiccant packs, and refrigerate. When your desired female is at about 25-30mdays of 12/12, turn off the fans, and dust a top and some lowers with a q-tip dipped in your pollen. A decent top that would yield about an 1/8 of bud will give you 100-300 seeds.....no need to do the whole plant unless you're in the seed business.