The category involves speedrunning all four tutorial "missions" that occurs at Marcie's Flight School (including the one that only happens during first play of the save file, so you have to create a new profile to make the mission)

And since there isnt any in-game time for th(ese) levels, you have to use real time for this category using livesplit or something (not counting the time spent in the baseball diamond hub world). Maybe first frame of the mission to last frame of mission, then add up the time during each mission.

Idk, this is some suggestion, implement it if you want or not lol