There's just too much content on Outland, if you add that most of it you need a good team to get anywhere, imagine the time you need. Also getting that "special" item may take hours. Now do everything with different classes, alliance and horde. You could play for years. I'm not too much for team play so for me playing alone on my pc as a serv... ehem never mind, well let's just say that I have control over the game and I can solo instances.