So... there must be a stairs or something that leads to the rooftop on the outside he just walked up to the rooftop of the pagoda in about a few seconds...? Akira and the captain spent at least half an hour crawling around, while this guy speed-hacks his way through? He's not even tired after the fall. His regeneration can give Cell a run for his money. Dude's on Buu's level now.
To be fair, we don't have a reliable perspective of how much time has passed, and other than that, Miyabi can just run inside the pagoda without taking dozens of chapters dealing with his own dungeon and minibosses.