The trip to Calypto took 2 months even with the starship using the best transportation techniques in the universe.
Not only did it cruise through the starry sky at an insane speed surpassing any 4th class being, it also traveled through three different long-distance teleportation arrays while doing so.
Cross-sector teleportation arrays were widely available in the Grand Heavens Boundary, but all those to Eden, Soul World, and the Beast Domain had been manually cut now that the Nox succeeded in breaching the three sectors.
Teleportation arrays were an immense convenience to the masses, but they were also an easy way to infiltrate the universe. These teleportation arrays were precisely how Nox geniuses like the Saint King were able to arrive in the Divine Realm.
Rather than the safety of those who lived in the invaded domains, keeping the Nox out of the remaining ones was more important to those in power.