How often does the Legion invade a zone?
Is there a repeating pattern to when there is a Legion Invasion in the zones in the Broken Isles? They seem to happen at completely random times, so it's hard to plan around when the next one will happen.
Solution 1:
Reportedly there's an invasion every 18.5 hours - done by Blizzard so that everyone will be able to experience one regardless of when they work.
There's a website you can use to check when the next one will be up.