Yeh I think Dishonored took me about 12-14 hours on a stealth playthrough while doing all the exploring. Dishonored is also just as fun 2nd time around because you can take a completely different approach than you did before. The DLC is great too.
The assassin vs. assassin levels were my favorite besides the whore house level.
As long as there's a Triforce, there will be a Zelda;
as long as there's a prosperous kingdom, there will be an evil bent on destroying it;
and as long as there's an oppressive force threatening Hyrule, there will be a boy...
in a green tunic, silver shield, and magic blade to stand against it.