i live in upstate ny about 15 min north of syracuse and i have been bagging my plants for about 2.5 wks now. the buds are already starting to form, the day night schedule is around 14 hours darkness right now and i have stopped bagging mine a couple days ago. the buds are still forming. a plant doesnt need exactly 12 hours of darkness to flower. if you give them a little boost with bags or tarps and your already around 2 wks into flower then i feel there is no need to continue. the dark period is long enough where they wont go back to veg. how far along are you into flower?