Thanks for all the replies ! I've been meaning to respond sooner, but apperantly my time left to surf the internets has not increased lately ...

@Whacker I'm planning on sketching out my own route, but I needed a quick idea of the distances and time needed to travel them, not being that familiar with US geography.

@The Fuzz We're actually going from the Grand Canyon to Phoenix, as the final stage in my all to ambitious 'try to see as much of the US as I can in 3 weeks' plan