Indeed. If you are going to do this then your capital has two jobs, it has to support you while you travel, and it has to bootstrap you back into Western life when you return (such as covering rent/deposit on a mortgage etc etc while you job hunt). Three jobs in fact as it has to give you a buffer for emergencies, if you have a health situation or need a quick repatriation for any reason. Traveling means
not living like a local in a poor country, because the locals aren't hopping on a plane at the drop of a hat, they live where they live and are pretty much stuck there. And you won't be having much fun if you have money worries hanging over your head!
Without thinking about it especially much I'd guess you'd want at least a mil in capital to pull this off, perfectly possible to achieve living a frugal lifestyle while working in Big Tech for 10 years - if you could bear it for that long.