According to the attitude seedbank & I assume the breeders cause thats where they get their seeds from, the white widow strain should be flowered 10wks but the last 2wks it should be kept in the dark (or at most 8hrs lights on) in order to get all those crystals its famous for. There could be some benefit in leaving them in the dark for a few day or reducing the amount of light...at least it saves on electric lol