Recess followed lunch, and if you finished lunch early you could go out early. I want to say they mandated fifteen minutes at lunch, with fifty minutes combined between the two, but my memories of decades ago aren't that good.

My distant decades mirror yours and I just recalled we also had playground time before class. At least 10 min. Maybe while waiting for buses to roll in.

That generation of adults seemed to understand that kids need low/no-adult play time.