DOOM's single player is at least 13 hours long.

In case you were wondering how long DOOM’s single player will be, well we have your answer. According to id Software, the average length of the campaign clocks in at a hefty 13 hours.

This could get interesting if it is done right because we all want some bloody gore entertainment. Obviously this is good news because we don’t want to speed run through the game as soon as we touch it on day one.
DOOM is to release on Xbox One, PS4 and PC.