Doom's Single-Player Campaign Lasts 13 Hours
 

Developers tend to stretch this kind of thing, so I'm going to assume it's more like 9 or 10 hours. .@Unreal389 The difficulty level plays a factor, but folks playing at the office average 13+ hours in the campaign— DOOM (@DOOM) February 11, 2016 A common criticism of FPSs these days is that the singleplayer campaign is too short, and kind-of half-assed. Bethesda's upcoming Doom reboot though is aiming to put story first, and today the official Doom Twitter account has commented on just how long the game will be. "The difficulty level plays a factor," said the developer, "but folks playing at the office average 13+ hours in the campaign."

http://www.hardocp.com/news/2016/02/...asts_13_hours/