3 weeks! The hairs are brown because they are pollinated. Use a pocket microscope to check the trichomes, when 80% are milky white it is time for harvest. Let the plants dry, cure for 2 weeks and make bubble hash (ice o lator) from the weed or another extract like rosin, BHO or tincture oil. Many options what to do with the weed and to get rid of the seeds! 😋