I used to work a corporate job with all the benefits, 401k, etc that also allowed six weeks vacations, but they would never allow me to take more than five days in a row off or we would "fall behind". So, for eight years, the comp time built up and grew I more miserable.
Then, after my first 6 week tour in Spain, I made the decision to leave the security and bondage of that career and became an independent consultant. It's much more work generating an income and no benefits or security but I now work when I chose and have toured every year for the past five.
Unless you have a good employer that give generous time off or lets your take sabatical time, the only way I see you can take a long tour, like the PanAm, is to work for yourself or chose a career like teaching or farming that has seasonal down time.
I wish the USA had more employers that would allow their valued employees to take sabatical or hiatus time but this country is so screwed up in our life values. We place work and money and consuming over experiencing life and the world. Plus, we have the attention span of a gnat.
CaptN Willard