So hypothetically if people where trapped in World of Warcraft like in Sword Art Online where they can't logout untill the game is beaten how long do you think it would take for the players to beat it?

Just for fun, it's the first one with none of the expansions, to beat it you have to kill all four of the opposite factions leaders and you are allowed to die with out real life consequences. Also let's say if all of the Alliance leaders are killed then only the Hord players can logout untill the Alliance player kill the Hord leaders.

Personally I think it would be 2-6 months. I mean with the main obstacle being time to play out of the way it's just a matter of getting to a high enough level, getting a large group of competent teams together and making your way to the enemy capitals.