[Physicist]

A disturbance to a field may very well propagate at Light speed, but that's an entirely different action, in my opinion, than the field *itself* propagating.

But once the field is there, it's there. What aspect of the field needs to propagate, other than any changes to it?

[Southack]

"But once the field is there, it's there. What aspect of the field needs to propagate, other than any changes to it?"

That's rich! It's also a bit beyond the scope of this thread.

We're simply trying to answer *how fast* the field gets there, not *why* it needs to continue to do anything.