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Personally, I'm convinced that 24/7 is faster.
I've been bodybuilding all my life and really into nutrition in that field too.
Now, it may sound like a stupid comparison, but I think there are a lot of similiarities and maximum bodybuilding and all other athletics is about working out just beneath the point of exhaustion.

It's not healthy and it won't make you live longer, but it beefs humans up for the period needed much more than training and eating moderately and naturally.

None of us are trying to create the longest living plant either, we're all trying to reach maximum Belgian Blue cannabis muscle in as short time as possible, so I think once they're strong enough, you want to grow feed and bodybuild the plants just below exhaustion.

If you do some googling, I think you'll find most modern research will agree.
I think the 18/6 regime is either for heating probs as someone mentioned, or an old hippy-gotta-love-your-plant-like-a-family-member sort of myth, apologies thccreator, but thats my take.

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