There's a number of routes and variations, certainly nothing canonical; a lot depends on your start/stop requirements.. for instance, I live in Seattle, and have family in New England, so for me it was easy to build a relatively short route (7300mi) that started in New England and ended just 2-3 hours from home. If you need to finish near where you start, a sort of circle route, that's going to be very individualized.. some previous routes might help, depending on where you're starting, but you likely still can (or may need to) do some research and modifications to optimize for you and you alone.