How long must a game so you can buy it?

[DragonLord]

Honestly, I don't care about the length if the game is "complete."

I've got games I've spent 8 hours on that are better and more worthwhile than games I've "made" myself spend 75+ hours on.

I play games for the "story." If the story can be told in 10 hours I'm fine with that.
What I don't like is games that rush or games that drag out what should only be a 10-15 hour game.

Length just depends on the game and entertainment value.