60hr campaign without the extras? That's insane. Means you'd be looking at 90+ hours with side quests and hunting and such. Dayum.
I read reports that the map is so big it'd actually be incorporating the map from the first game into its world. I'm a little skeptical of that claim, but it's certainly feasible - everything I've read about this game seems to indicate it's going to be a technical powerhouse. Raising the bar is all Rockstar knows.