Only speaking from experience mate, thats why a lot of people follow trends, someone will say 20 hours, another will say 20 so the next person uses 20 hours, i was told not to run mine 12/12 id be wasting a seed and what not but to be fair it looks im gonna get a couple ounce off mine, so in daylight with less than 12 hours of light left a day he could still yield something worth his time but any less obviously will be a waste of time and he would better off leaving it till next year or bringing it indoors.
This is day 53, its still got another 10 - 14 days to go.
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