Church bells chime on the hour for most of the day.
I once imagined a nightmare: a classroom full of children who all had watches that beeped on the hour, not synchronised, with slightly varied pitches and patterns.
That was my classroom throughout the 80s and 90s.
As a child it fascinated me, but as an adult (who had a job in the area) it got tedious really quickly. 15 minutes is not that long.
Edit: From what I could gather in a couple of minutes it still seems to be pretty widespread. There have been some court cases about it, to get specific churches to silence the bells, but not in general.