Oh boy, this is a lot to talk about.
To put it simply, the size of Samsonite’s domain more or less depends on what you define as the “mortal world.”
Disclaimer: How big Samsonite’s domain is will primarily affect Samsonite’s major speed feat covered in the Feats section, and thus will be the main focus of this section.
For starters, his domain contains bare minimum every closet and space under every bed in the world, so using that, you can estimate its size to be about 12,335.93 meters across, and so, his feat of pulling Mr. Dad to the end of his domain would get to around Mach 0.86, which while notable, is a far low-ball.
We are shown Samsonite’s domain contains an entire copy of the mortal world within itself, including copies of residents within it, such as when Mr. Dad ran into a copy of himself within it.
Given Samsonite is established NUMEROUS times to operate on a world-wide scale,
being hyped up as a being that could bring about the end of the world, and the fact that Samsonite’s domain is directly portrayed as a mirror version of our world AND that it stretches across every single closet and bed in the entire world, the assumption that the domain’s scope is comparable to that of our planet is pretty reasonable. With that, Samsonite’s best direct speed feat can reach up to Mach 885.46.
Finally, the highest assumption for the size of Samsonite’s domain follows similar logic, but assumes a greater scope for the mortal world. We see briefly that Samsonite’s domain appears to contain an outdoors of sorts, with its own sky. The domain of The Green One, a comparable being to Uncle Samsonite,
also features a fully clear sky with its own Sun, and given Samsonite originates from an entirely different dimension (Hell. Literally just Hell),
AND that we know this realm exists beyond the mortal world, there is an argument to be made that the scope of Samsonite’s domain may hold an entire universe within it, as it would make sense for literal Hell to be outside the scope of our universe. Now, in fairness, this is absolutely a very high-ball interpretation without super solid evidence, so we won’t be relying much on it, but it is a possible argument to be made for it. Using this assumption, Samsonite can reach a MAXIMUM possible speed of 69.84 Quadrillions X SoL.
For a more reasonable high-end, since we know The Green One’s domain contains a star, we can assume it’s at the very least a similar distance from Earth to our world’s, so assuming Samsonite’s domain is of similar size (perfectly reasonable, given both entities are consistently portrayed as equals, with Samsonite seemingly being even stronger), Samsonite can still reach speeds of up to
11.85 X SoL, which is likely more understandable to many.
