I have Gen 8 microserver and whilst it's not fast to POST and get to boot it would be under a minute. I'd expect the Gen 10 to be similar.

It's kind of good in the sense that that's typical of servers/workstation grade hardware. Also being a NAS mine is rarely restarted. Is that really an issue for an always on machine?

I have an older N36L that I don't use that would have been slightly quicker but was also more consumer grade.