I live next to a school, and it has a 30 minute lunch break. I went to three secondary schools growing up, and checking their timetables, they now have a 35, 40, and 45 minute lunch break respectively. I suspect some of them have shortened the break in the 20 odd years since I left.
AIBU or is 30 minutes too short to eat your lunch, go to the loo, and socialise?
(I often take an hour out for lunch at work as an adult, but it's not as if I'm on the clock.)