Yes it is possible to harvest every 2 month with only 16 female plants and get around 300-350 grams of Yield (some people manage to produce 400 grams!!).
www.marijuana-seeds.net/6-times-a-year.html
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Hydroponics gardening resources by Maximum Yield, a free how-to hydroponics gardening and indoor gardening bi-monthly magazine that is distributed internationally through stores that retail hydroponics gardening products.