I've been going through the Master Chief Collection on PC, and I never realized just how short some of these games are. They're all around sub-10 hours, even less if you know what you're doing. I know FPS games aren't exactly known for their long campaign modes but back in the day these felt much longer. Maybe it's because I'm coming off of stuff like Bioshock and Doom Eternal, which are longer in terms of campaign, and third person games like TLOU2 and Death Stranding, which lean more towards 40