15,646m by adding the vertical drop of all 6 main sections. This does not include the stations, and assumes the finish line in the city is at sea level. So, almost twice the Everest Likewise, peak 2 is just above 10km and peak 1 is 7.2km high.
Basically a slide is when you put the back of the board in the ground, that way you’ll be on the ground while actually being considered as in the air by the game, so it looks like you “slide” on the ground, Kele does a lot of them during the run. And the thing is it’s considered a glitch that can make you go faster, and since clean is supposed to be glitchless... uh idk