Ask HN: Cost of not being on time?

I am always getting annoyed when people think it's acceptable to come 15min late to a meeting. Just considering a 4 engineers meeting that is a loss of 1 working hour. Over a year that can add up to hundreds of hours which is a significant cost for any company.

Apparently there are even worse cases where people come late and introduce cost (e.g. missing an appointment with an investor). I am curious if anyone has some stories to share about the cost of not being on time.