Definitely realistic, I have done it twice in a 150 mph plane with next to no storage (varieze). Would do it again in my kitfox which so far has only been as far as Oshkosh. I recommend the book Flight of Passage abou two kids who make the flight in a Cub. If I where planning such a flight today I would allow for 2-4 weeks depending on what I wanted to do along the way.