I'd say about 5 million [after taxes = ~100k per year and I was covered for health/dental/vision either through a plan or the government] would allow me to live comfortably until my warranty expires.
I would immediately go on a few cruises and visit quite a few places around the world while I'm still young enough to enjoy it [and do so with extreme frugality]. While traveling - I would try to find a place which would allow me to stretch my currency as much as possible [live like a king without the high prices associated with it].