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i have actually only heard of a 72 hr dark period and my plant showed sex 3 days after 12/12 was initiated. MJ actually takes about to weeks to realize that the light cycle has changed from 24/0 to 12/12. the 72 hour dark period actually shocks it into flowering immediately and no harm is done to the plant because it is actually quite hard to kill MJ if you just give her the basics: water, light, and right temperature.
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