I had to harvest at 6 weeks because I was moving, but I am certain that if I took it longer, she would have grown a lot bigger and yielded a lot more. A buddy of mine told me "they put on most of their weight durring the last 30% of their lives" and I have seen a lot of people, online, say that it is well worth it to take autos about 2-4 weeks longer than what is recommended by the vendor. Muddy's guide at "https://www.autoflower.org/f44/life-cycle-auto-flowering-cannabis-5113.html" was and continues to be my grow guide. I stick to it like a zealot to religious scripture, lol.