The Rebbe argues against granting too much free time for students, especially during holiday times.

The Rebbe makes three suggestions: To assemble the children before the holiday to review the laws and customs. To hold an assembly during the holiday, without the need for separate classes, etc. Parents should not rely solely on the school and must supervise and guide their children. https://www.torahrecordings.com/rebbe/igroskodesh/012/007/4197