My last grow I had Gorilla Glue autos and the trichs never did get any color so I just went by how much they were drinking. Once they slowed to minimal water intake I knew they were done. 100+ days. Now I have Chocolate Skunk and DarkDevi’s going both autos and the CSkunk is really close to coming down now at 85 days but she is still drinking about 3 liters every 3 days.