The video took me longer to make than the app! I don't know how youtubers do it so regularly.
They have a team :)
Not all of us do. If you can get to an average of 300k+ view per video then you can hire an editor and maybe someone else on a contract basis to assist. Must of don't have a team though.
Yeah sometimes they eventually hire an editor but I think channels like Cutting Edge Engineering it's a fulltime job for one of the two people to do the filming and editing.