The Harrowing, for example, affects the entire world, even though Bilgewater suffers it the most, while their origin lies in the shadow isles. So far, we know that Rek'sai is in Shurima, something bad happened in Icatha, and there have been several Void attacks in Targon and Demacia.
I've understood it as the void is another dimension, basically an alternate universe. So infinite?
Its influence is likely infinite,as it is a seperate realm between dimensions.
I mean the Targonians seem to be worried about the void and even Aurelion Sol knows it,which might mean that it is also a problem on other planets.
Aurelion Sol described the Void as an 'oblique infinity' in his short story.
It's fair to say that he wasn't lying about what he saw.
