There's a Batman: Arkham City interview on guardian.co.uk discussing the upcoming superhero sequel with Sefton Hill, game director at Rocksteady Studios. Along the way, he tells them how much gameplay to expect, saying: "It takes over 25 hours to complete the main stories in Batman: Arkham City," and that: "The Side Missions in Batman: Arkham City are a good example. We have around 15 hours of story that's off the main path. It's completely down to the player when and how they want to tackle this – there's no right or wrong time." Thanks Destructoid.