From the info I’ve gathered, it’s not so common for everyone in single player
Anyone who has a base around the south of Mounds of the Dead up to the Frozen Temple won’t have an issue with Star Metal. They are within viewing distance of the meteorite event which is required. If you live in the 80% rest of the map, the meteorites won’t spawn at all. You have to visit the general area of the map and stay until the game does a check for spawning the event. Then if it doesn’t spawn, you wait 30 min more. Only those who has bases far away struggles with these meteorites as they play most of the game outside the event area. And I’m guessing that Isle of Sipta has a much bigger part of the map that allows you to view the meteorites fall. I don’t have Sipta though so I wouldn’t really know.
Though when meteorites spawn, they stay for roughly 4 hours regardless of how far away the player walks.