

I finished DOOM (2016) in 8.8 hours. Granted I didn’t stop for collectables and was on normal mode. I tried Eternal but got bored after 2 hours so that’s what I’m basing it off.
My steam friends currently have about 17 hours (they bought it early) but they like collecting stuff and getting 100% achievements. I’m not sure how long the story is without 100%ing it but it shouldn’t be too different from the other games.
Who said I was rushing? Gathering the collectables is a chore so I just progressed through the story and finished it.
Edit: Also my friend 100% the new Doom game on the highest difficulty in 21 hours. Doom games are short in general.