Feat here: https://youtu.be/RQypxH_ySUA?t=602 The Spark Hunters all leave Cursa’s Stronghold to go to their planets where they’re fought, including Midnite, who’s fought on the Pristine Peaks planet, four levels outside of Cursa’s Stronghold.
Considering Cursa’s stronghold is introduced as an entire solar system (and clearly none of the levels match the ones in the stronghold at all), and it being repeatedly stated that Cursa has conquered the whole galaxy, it is extremely likely that each planet visited is in it’s own solar system. This is supported by the fact that the first level, Beacon Beach, is the closest level yet still outside of Mario’s solar system, considering we’ve seen the solar system in games like Mario Party 6 and Mario Kart 7, with no indication that this planet was ever there, so we know there is precedent for solar system-level distances between levels.
We know these Spark Hunters didn’t use the warp technology that the heroes use, considering that requires specifically Purified Darkmess energy, and the Spark Hunters were specifically tasked with protecting Cursa, so the last thing they would do is get Purified Darkmess Energy which can only be harvested by defeating Darkmess.
Finally for the time frame, it realistically shouldn’t be any more than an hour. They leave at the same time the heroes get to Beacon Beach and Midnite had already captured Rabbid Rosalina well before the heroes got there, as evidenced by the massive amounts of Darkmess surrounding the Winter Palace. So the entire trip for Midnite must’ve been less than the time the heroes spent at Beacon Beach, which isn’t implied to be any long stretch of time. Nevertheless, I’ll use a low-end of 3 hours, a mid-end of 1 hour (which I feel is the most likely), and a high-end of 30 minutes.
For the distance, let’s assume the planets are at the farthest possible edge of the solar system, so let’s use the distance from Pluto to the nearest star outside of our solar system (these planets are shown to be not as big as the other planets so using Pluto makes sense). The distance from Pluto to Alpha Centauri is 4.37 lightyears, and multiplying it by 4 (because Cursa’s stronghold is 4 star systems away from Pristine Peaks) gets us 17.48 lightyears for the distance, or 165,378,280,000,000,000 meters.
Low-end: 1.6537828e17 / 10,800 (3 hours in seconds) = 15,312,803,704,000 m/s or 34,253,823,117,000 mph
51,078.02c
Mid-end: 1.6537828e17 / 3,600 = 45,938,411,111,000 m/s or 102,761,469,350,000 mph
153,234.05c
High-end: 1.6537828e17 / 1,800 = 91,876,822,222,000 m/s or 205,522,938,700,000 mph
306,468.09c
A good baseline for the feat, but kind of a lowball considering we know Cursa had spread all over the galaxy. Though there’s no way to truly know the distance between the worlds, so this is the best so far.