Here in Austria we have a general draft, so every man (or rather boy) has to do service in the military. And in the military we had the saying that went like “For a soldier, five minute early is on time.” That’s a good habit to pick up!
But after that I went to university. And I don’t know what the culture is like on other European countries, but in Austria there is the term “academic 15 minutes”, which basically means that almost anything on university starts 15 minutes later than advertised and/or that students as well as professors are usually 15 minutes late. Throw that in with what I picked up at the army, and now I’m usually 5 minutes late on average, haha!