I think that I’ve settled on a route up and back… It’s 40 days and 40 nights!!! RT mileage for this route is working out to be around 11,200 miles with 3 LONG days at the start, with the rest of the days being around 300 miles or less.
https://www.google.com/maps/d/edit?mid=z8ajQXHHiLxI.kolDpX_MXaS4