We'll I heard it takes 3-4 days of constant travelling although I do believe there is a train which does go from one side of America to the other bolt should have got on that one. Wait... If I recall I think bolt did get on it :P
Hmmmm i'll say 2-3 weeks. Because i have whatched the whole movie like....30 times. if anda count all the scenes together, it makes nigth and hari scenes.