re: Order 1886 only takes ~6 hours to beat, half of which is cutscenes

I kind of view the the length of games this way...

An average movie at a nicer movie theater will run you about $15. They usually last about an hour and a half at minimum.

Using that as a rough guide, I expect a $60 game to give me at least 6-8 hours of play time if I simply rush through to completion. As I rarely plow through a game like that, that means I should be getting about 12-15 hours on my first playthrough on normal difficulty. (due to level grinding, collecting whatever I need to collect, getting lost, dying, etc.) Anything significantly shorter than that had better have a really good multiplayer that I will come back to or other some kind of hook for repeated playthroughs (alternate endings, speed runs, collectables, whatever floats your boat)

Its not a hard and fast rule but simply a guideline that seemst o work for me.