Arkham City is five times the size of Arkham Asylum

Will take roughly 40 hours to complete.
Rocksteady have told IncGamers that Batman: Arkham City is five times the size of Batman: Arkham Asylum and will take roughly 40 hours to complete.
When we quizzed Rocksteady’s Dax Ginn on the length of the game, given the high-number of ‘super-villians’ that appear in it, he told us:
“Geographically it’s five times the size of the first game’s Arkham Island, which is ridiculous. In terms of gameplay it’s roughly 40 hours long in total. It’s big.”
Let’s hope those 40 hours are as engrossing as the time we spent playing Arkham Asylum.
Read our hands-on preview of Batman: Arkham City here.