When should I harvest my autoflower

When it is ripe.. JK 3-4 weeks? i see a lot of 'long' pistils, so the calyxes have not fully ripened/fattened up around them, yet. Once the plant has fully fattened up, then you can start to scope those trichomes. Lots of different suggestiosn in regard to that. Personal preference is a huge part of it. 10% amber? 70% amber? whatever you want. Do scope multiple locations - not just top colas but mid level and lower buds too. it's as much art as science due to this averaging out of what you see across the plant(s). if not familiar can pull buds off early or leaves some to ripen a bit longer, while taking the bulk at what you think is your prefered point. Learn what you like best in 1 grow instead of several grows over a long period of time. 2 weeks isn't out of the question. some plants do ripen/fatten up faster than others. But the trichoems are your guide. Don't worry about estimating the length. just put your head down, scope the trichomes and react when appropriate.