I had the following error message pop-up on me this evening:

And I thought, huh, I guess I have been playing for a while, so that sort of error isn’t that weird, how long HAVE I been playing anyway?

It turned out that I’d been playing for twelve straight hours without even really noticing, hunting deer and looking for challenge tombs and doing optional missions and occasionally advancing the story.

I don’t think I’ve gotten this sucked into a single player game since, maybe, Skyrim?  It’s so dang good.

Also, benefit of playing on launch weekend while most people are still focusing on the story mode, I got to cheese my way to the top of a leaderboard.  I will almost certainly be dethroned as of tomorrow, but for now this makes me feel all warm and fuzzy inside.

A second benefit:

My only achievement ever with a 0% global completion rate, so it’s something that less than 0.1% of players have, um, bothered to do.

That sounded a lot cooler in my head.

Anyway, good times all around. 🙂