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How does the 1 month compare to the 0 month trial period offered by of MacOS?

I think one month is decent. But I'm pretty sure if it would be 2 months, you'd say 2 months is pretty short (why?), 3 would better (sure, more is better).

The main issue is that the duration is variable depending on when the VM was released. When I checked earlier (not sure if this is still the case) the license was valid for 90 days after release.

With slmgr /rearm you can extend the license period. IIRC a couple of times but not unlimited, but I definitely got more than 2 months out of it.