There are a lot of topics on forums in what case Japanese people use 24-hour clock format. But I have never seen how it should be pronounced. It's not hard to say something like 8:05. This is common and sounds like 「はちじ ごふん」, but how will it be if I want to read 15:40 or 19:20 etc. I didn't hear anything like 「じゅうごじ よんじゅっぷん」 and I'm confused how it should be read.
Is it usual for Japanese people to translate 24 format into 12, or are there any edge cases they would use 24 strictly?