Best case scenario is some sweetspot between quality and quantity . I think this isnt an FPS, RPGs should be lenghty, but i would definitely take 50 hours of great game over 100 hours of suffering.
Honestly, I would be disappointed with 20h. I would like to get at least 50 (main + sidequests) anything more than that and I am happy. But budgetwise, I dont think we are getting that much.
I know, that this is gonna change according to amount of funding you will get, but what can we be looking forward in terms of hours? 50? 100? What are your plans?