idk i saw the 3 hour thing...i dont think it changes
you just run though a prison (similar to that of oblivion but instead of running out the prison your running in) and then you make it to a cave (its through a dungeon which is through the prison) with a dragon coming after you destroying areas and whatnot, after which you leave by finding an exit...seems to basic to interpret change, maybe minor things but nothing overly noticeable.