Earlier quoted context omitted.
You're correct. We call the 24-hour clock "military time" and basically no one uses it casually.
I do. Granted, I was in the military-I passively hate it when people call it 'military time' (passively meaning I mentally roll my eyes when someone says it), but I've been using it since middle school when I first even learned it was a thing. Mostly because it made sense right away. There are 24 hours in the day. Why are we recycling numbers in our time system? No really, why?
12/2=6, 12/3=4 work well, (with /4 and /6 being repeats of those)
24 hours doesn't add much on top of those divisions (you get /4 with a repeating /6 I guess)