According to a recent tweet from the official Doom Twitter account, id Software is estimating that the upcoming reboot of Doom will include a 13 hour campaign. This will of course vary for different players, but in todays world of short or even missing campaigns from games, this is good news for those who are looking forward to playing through the single player portion of the game.
Here's the tweet:
.@Unreal389 The difficulty level plays a factor, but folks playing at the office average 13+ hours in the campaign— DOOM (@DOOM) February 11, 2016
Doom launches May 13, 2016 for PlayStation 4, Xbox One and PC.