When I open settings of a category and I want to setup slow mode and/or auto closing, mins are default and there is option choose hours, days etc.
If I use anythng else than minutes, and at some point I want to change back to minutes that isn’t available any more.
I reckon minutes are quite rarely used, but slow mode is a bit different thing. When I want cool down overheated topic, for my user between 15 - 30 mins is enough, because only those who are online at the moment are an issue.
So this is defenetly not a major class issue. And there is big chance this should not be counted as a bug, but UI flaw instead.