[21twelve]

I’ll stick with this as I am simple-minded as well.

I’m pretty sure the “...number of days (23)”; the (23) refers to a cited reference, and not the number of days it can survive outside the host. In some cases (dry??) it can survive many hours. In other cases (moist, wet?) in can last up to 6 days.

[Chgogal]

I wasn’t precise. The temperatures impressed me.