Long maps with over 5 minutes of draining time fit the Approval category. Only then they are allowed to be single difficulty mapsets. If they are below 5 minutes of draining time, a full difficulty spread is needed and the map will have to be ranked instead.Short story: I saw that Taeyang's remote control map got qualified, but I noticed that the drain time was only 4:54 according to the website and the editor. I was then later informed, that the time listed is inaccurate, and the map was actually fine.
If the time listed is not fixed, I think the rule should somehow mention that it is inaccurate to avoid confusion.