I have been in Thailand for many years, and my qualifications regarding visas is way beyond yours, your condescending guesswork is is laughably wrong. I wont bother with this petty forum again.
Inane, childish, and insulting response, the question was how long on that visa, no mention of extensions, border hopping or other ways to remain in SEA for long term. You can't "maximise a visa", a single entry visa no longer exists after one entry. What happens in country is a separate matter.
The Insurance Companies chosen by the health department (then Minister Anutin) as acceptable for this scheme obviously had to meet certain conditions similar to what is now being offered directly by the IO.