Ok, so what have been said implies the owner of the structure knows when the moon-part gets mineable.
So you dont need 24/7 presence.
Small parties could affect those mining ops. It also been said that you could visually estimate how long is left to be mineable.
I hope content is created not only around refineries itself, but around mining ops.
I dont know how much static defenses has been stated for the refineries, I hope you need an actual defensive fleet.
I'd hope minig rates for moons gets higher (keeping whole value similar). So it decreases the chore, but at the same time increases the value of ninja mining, or simply attacking it.