You can't go by "time" with an outdoor grow and only gets you close on an indoor grow. Most plants use the following to tell if ready for harvest: 1) 70-80% of the pistils will have turned darker (brown, orange, purplish, etc) 2) the trichomes will have gone from clear, to milky, to amber and still maintaining the "mushroom" look 3) in most the fan leaves will turn yellow. Hope this helps. I am an indoor grower, so maybe go to the "outdoor grow" section and check there.