You already beat Arkham city??? Did you go buy it at midnight and play for the last 10 hours? Holy crap man.
You finished it in a day? 100%?
What is this, Portal with a Cape?
No, I know some guys and got a copy before street date. I'd say the main story is at least ten hours, and that's all I did so far. But there are still tons of side missions to do...
- Rescuing Hostages from the Riddler (plus all his challenges and trophies)
- Tracking down Titan containers for Bane.
- AR Training (which gives you upgraded gadgets, like the Grapnel Boost)
- All of the Robin and Catwoman stuff.
- Rescuing political prisoners.
- All the challenge maps.
It's gotta be at least 25-30 hours of stuff with all that included.