Hi Wheezy Mango
Hi mate I done Gorilla Autoflower.
And it was fully matured at week 11.
You would like to give a flush middle off week 9 or beginning week 10.
Then you only have to water with PH 6 water till 95% off your Trichomes have turned milky white.
Once you seen 95% Trichomes are Milky White leave her in a dark cupboard for 2 days. And you will have a very high potency fully matured gorilla buds my friend.
Hope this helps
Good luck growing.