Remember when Ubisoft's Patrick Redding told you that Splinter Cell: Conviction would last 12-16 hours? Well, he was lying. Or rather, he was only referring to the single player campaign and co-op modes.
Factor in Deniable Ops, the competitive multiplayer mode, and according to Creative Director Maxime Beland the figure is twice or thrice Redding's estimate.
(VideoGamesDaily)