How long is the Warhammer 40K: Space Marine 2 campaign?

Warhammer 40K: Space Marine 2 is a game consisting of three main parts. You have the campaign and then PvE and PvP multiplayer modes that will keep you engrossed for dozens of hours. But it’s definitely worth knowing how long the campaign will take you.

I believe that the campaign is the best place to start with Warhammer 40K: Space Marine 2.