Hi, our bucket list includes visiting all of the 50 states and we are about half way. Thoughts on our next trip would be to travel across the northern states by leaving from San Francisco through Portland and Seattle and then across Montana the Dakotas and either flying home from Detroit or going all the way to the east coast .....perhaps flying back to the U.K. from Boston. Thinking of the bulk of the trip being in September. Can you advise of the optimum timescale to allow for this trip? I’m hoping 4-6 weeks would enable us to feel that we had done it justice. Thoughts?