Batman: Arkham City will offer over 40 hours of gameplay making it 4-5 times more entertaining than the average game.
According to an interview with game director Sefton Hill, Batman: Arkham City promises over 40 hours of gamplay. 15 hours of side missions sound awesome. The main story line will account for 25 hours of gameplay.
Most games are 8-10 hours and seeing as how well done the original Batman was, this should make any fan excited.
Batman: Arkham City will be out October 18, 2011 for XBox 360, Playstation 3 and Windows PC.