How long will the game batman arkham asylum be for xbox 360?

Anyone know how long the game might be to beat it? Because i don't want any short games but this game looks awesome, they should add co-op with Robin and more Villans like the Penguin. I'll take any guess's but please explain why. Thank You!|||People who have claimed that they have bought the game early (some stores do a special early release in certain locations) said that on normal mode the game takes approximately 12 hours to complete the story. No one has said how long it takes to beat all challenge maps, collect all riddler trophies, etc|||Why add co-op with Robin? That would ruin the serious element of the game. That would make it too much like all the other Batman games that suck! This is a solo game! You can't stealth around the game with two people!





Also, at this point in the comics, the Penguin isn't as much of a villian anymore

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|||No one knows. It hasn't even come out yet.