rule of thumb with autos:read the leaves.
if you have a healthy grow all the way through, look at the color or the leaves to tell you when to chop.
green leaf = clear trichombes. (not ready)
yellowng leaf =some clear mostly milky trichs (ready to come down when you are)
brown or dying off leaf= all milky trichs, some amber if that auto does amber up. plant fully mature and on the way to degradation. narcotic stone when taken at this stage. takes about 3 weeks to go from yellowing off stage to this stage.
use the leaves as guide for your harvest window. some like a clear buzzing high, some like to melt into the couch. I like a good medium inbetween, I take mine when the leaves are mostly yellow after a good 2 week flush