I never had anything not aligned to '5' minute intervals (5 minutes breaks minimum between classes, and one or two longer one, 15, 25 minutes). At college, eve

I never had anything not aligned to '5' minute intervals (5 minutes breaks minimum between classes, and one or two longer one, 15, 25 minutes). At college, everything was 15 past full hour, for 45 minutes, then 15 minute break.