Halo is a great example, actually, because even though Halo 1 is a relatively short game (I guess normal by FPS standards but in general it does not take long to beat, even on a first playthrough), I got way more than 60 hours of playtime out of it. Easily hundreds. A game doesn’t have to have a long storyline or whatever to offer a lot of play time. Sometimes having replayability, post-game achievements that are fun to work towards, or compelling multiplayer, for example, is all it takes.