I've spent the last several months researching schools for my child entering kindergarten.  Two of the many questions I asked were
How many minutes of recess per day?
How many minutes of lunch per day?

The answered ranged from a single 20 minutes recess with 20 minute lunch, to a single 25 minute recess and 30 minute lunch.

The most generous private school had two thirty minute recesses with an hour lunch. That school did not offer a lunch program. Everybody brown bagged it. 

Guess where I saw skinny kids?

Instead of agonizing over whether Johnny and Sally are consuming too many calories, how about more time to run around?