Let's say you travel every week day once on each direction (480 trips). The average person will be off their expected arrival time by more than 5 minutes on 72

Let's say you travel every week day once on each direction (480 trips). The average person will be off their expected arrival time by more than 5 minutes on 72 trips. Of those 72, how many are over, let's say, half an hour? In Buenos Aires I could say that those kind of delays are something that I would experience maybe 12 times a year. They happen, they stand out, they are annoying, but I've also been stuck in traffic for that long, about as often.