Important to remember that the distributions here are multi-modal, so averages don't represent the data well. For AAA games I think you're way off. Looking at the 5 top played games in 2023, "main story" to "completionist":

    Title                  Main Story (hrs)      Completionist (hrs)
    Baldur's Gate 3              57                    146
    Super Mario Wonder           10                     19
    Starfield                    22                    145
    Zelda: ToTK                  59                    235
    Hogwarts Legacy              27                     68

Of these, the first two are co-op but not the same kind of multiplayer I think you allude to. Super Mario Wonder is not, I think, what many people would call "AAA".

If we add Spider-Man 2, that's still a 17 hour main story, and has been criticized for being "too short". Many people who purchase AAA titles do expect 20-30 hours of entertainment, for a ~$2/hour return. And the Game of the Year is the title with the second best ROI!