From a fellow grower: I’ve bought your auto-flowering Gorilla Glue strain. I was really attracted to the 2 month flower time, but I am a complete beginner and I have some questions that I would really appreciate an answer to: 1. Is the grow cycle truly 8 weeks? Is it perhaps 8 weeks from the seedling stage? Does this mean that literally 8 weeks from planting the crop should be ready for harvest? 2. Do I switch to second stage nutrients at the exact halfway point? 3. Will I still be able to get a decent sized yield if I don’t use fertilizer and protector as you’ve recommended?
8 weeks is the est flowering time.
Add about 4-5 weeks to this for veg and sexual maturity. ( pistils to show ).
A lot of autos can give pretty substantial yields if treated properly during their grow cycle. ( Lights , temp , feed , etc ).
Some of the better experienced growers can achieve 10-12 oz per plant. 4-6 would be a reasonable estimate for your first grow.
Hope this helps a bit. 
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Ultimately the finish date is subjective, but the prevailing method on this forum is to visually check the trichomes under >60x magnification. You will see the glandular heads turn from clear to opaque to amber. You can find many example online.
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We don’t know what medium you’re using. We don’t know what light setup you have. If you join here, and start a grow journal we can help you plan and execute.
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As far as yields go, for your first grow I personally would recommend a maximum of half-strength nutrients based on the manufacturer’s feeding schedule. So for example, if you use General Hydroponics, follow their schedule but cut the nutrient additive in half. I would not worry about comparing your first effort against anyone else’s; the people who manage massive yields are riding a dangerous edge that is too easy for a beginner to fall off. You can expect very good yields/input($) if you plan and execute correctly.
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Here’s a grow journal where it took ~10 weeks. The thread also covers trichome development.
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