When I was asked this question it did make me think. I don’t have a definite answer to this, as with me it all depends on the game. Before trophies and achievements were unleashed to the world, which gave games more longevity, I was quite content with just playing a game and enjoying it. Games like Jak and Daxter, Ratchet and Clank on the PS2 were just a couple of games where I could just sit and enjoy them for what they were.
Whereas games like Final Fantasy are at times a hard slog and required you to put in around 30 hours minimum to complete. You’ve got side quests, extra weapons and spells to find etc and some people really enjoy doing this. But I prefer to get to the end of the story, and then move onto the next game.