For me 6 months on and 6 months off would be incredible. But of course by the time 6 months goes by, someone has learned how to do my job and maintain all the shit I built, and I'm no longer valuable. Also I lose my health insurance and probably seniority. But man would it be sweet if I could make it work.
This would be my dream setup as well. Heck I would do 7 days a week 12 hour days (with a few mental health days built in) for 6 months if it meant not having to think about work for the other 6. I'll even live on a cot at the office during the work 6!