Hello ! It depend on your trichomes ratio and the effect you wanna get from the plants. I guess that after the 13th or tthe 14th week your trichomes ratio will be more on the milky/amber side for a narcotic couch locking effect. If you can go 14 weeks with the good trichomes ration ( The good one is To The one you want) then it will give your plant more time to swell and sometimes the terpenes profile can evolve with the time to something slightly different from the actual flavour. I hope it will help you 😁✌️🏼🦎