I suppose having grown up with 24-hour digital clocks since they first appeared in the 1970s, and most of the clocks around the house and on various devices being 24-hour digital, and using public transport which operates in 24-hour time, there is no "translation" that occurs, most Europeans are simply bilingual in 12/24 hour times.

1745 to me just means what 5:45pm means to you, but I never translate it in my head. In fact, if I'm texting someone older who I think might not naturally use 24-hour time, I have to translate to 12-hour time and it always feels odd to write the am/pm suffix.

Nope, cause everyone around means 15, when they say 15.

And everyone "gets" that all numbers after 12 are late-day.

15 only is odd if someone else is expecting to hear 3p

Or you just have a secondary dial. The watch I'm wearing right now has a major 1-12 dial and a secondary 13-24 dial. But my other watch has a 1-12 dial and a secondary 1-24 dial, with a funky secondary hour hand, so perhaps I'm weird:-)