3 weeks. Assuming they turn cloudy in 2-weeks, you will get you a potent harvest with an okay yield, 3-4 weeks will get you a slightly less potent harvest but a much larger yield. It's almost worth it to wait that extra week. Whatever you intend to do, make sure you do a water flush for the last 2-3 days The 24-72 blackout period doesn't actually do anything.
Cannabis Cultivation
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Sounds good. I've heard that for hash production it's probably worth harvesting a little on the late side for the large trichomes, might lean towards that. Will definitely flush either way.
A week easily, maybe even two.