I had a male reveal itself at about 4 weeks veg, I was 95 percent sure but let it go another week and a few days into flower until I could confirm. As stated they can reach maturity in veg, this plant was the first of the 5 to start alternating nodes and first to show signs of preflower.
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Plants were 5 weeks from popping soil on the 20th, first pic was the 23rd suspicion of sac, second pic was today and you can clearly see the sac and the shaft.