Lots of folks run 12/12 from seed to keep plants small or to run a bunch of seeds in a pheno hunt. It won’t start to flower regardless until week 3 or 4 usually. I have a 4 plant count limit so I run 60 plus days in veg usually and try to make those 4 count as far as yield goes. Lots of ways to go in this hobby which is part of what makes it great. The only real constraint on how long you veg for is the size of your grow area. Just need to allow for proper light distance.
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