I played the game to death last year, trying to uncover every little side event, and I can safely say that will take you upwards of 40 hours, with a lot of text skipping, and I know for a fact that there are still outcomes I've missed.
For those making that comparison, I have to say that this is not a Princess Maker style of game at all, it's more of a visual novel with a more complex path finding than simple choice of response. That is to say, there's not a lot of sim life freedom of choice - you're following a story. A story that has a lot of branches, but still, overall, a fairly rigid story.
There's enough here, though, to make you come back for a different experience. It's fairly rare for two people to have the exact same path reaching the end of the game. Most events have several solutions, especially the big important ones. Sometimes they're advertised, sometimes they depend on hidden skill checks or previous choices. Really, there's much more depth and branching than you'd think, it's just not always very obvious how to find them. There's a checklist with some fairly obscure items on it, and some that can be resolved in different ways.
Of course, it's not a game for all people, but then no game is. It's a game for people who like to experiment, and like to immerse themselves in story and minutiae. It's a game for people like myself.