11 weeks is 77 days from seed. I try to hold out to day 80 at a minimum when growing autoflowers, just out of general principal. If you figure most don't show sex until the 3rd or 4th week, and most strains need about 6-8 weeks to flower, you're looking at 9-12 weeks for the average strain. I agree with GA6, I'd give her a week of water only then harvest. I'd anticipate just over 10g dry.