It turns out, the Lucasfilm Story Group doesn’t worry too much about those details, as Rogue One: A Star Wars Story co-writer Gary Whitta recently revealed that the Star Wars brain trust told him, hyperspace moves exactly as fast as the story requires.
One example of this is the Star Wars concept of “hyperspace.”
While entering hyperspace involves traveling faster than the speed of light, a common part of distance travel in science fiction stories, the details of hyperspace are a bit more vague than that.
Just how fast is a ship going when it is traveling in hyperspace?