My classes had a 15 - 20 minute recess period around 10:00 AM before returning to studying for 2 more hours, followed by lunch at noon. (well.blogs.nytimes.com)
Every class must be followed by a 15 - minute recess break so children can spend time outside on their own activities. (edition.cnn.com)
Let's face it: the current 20 - minute recess sessions are not long enough. (edutopia.org)