classtime

Alternative forms

 * time

Noun

 * 1) the time devoted to or prepared for a lesson at school or elsewhere; schooltime
 * 2) * 19th century, Youth's Companion, Vol. 73, p. 50
 * ...youngsters who grinned at her decisively in classtime...

Usage notes
Still most commonly encountered as two separate words, rather than in its hyphenate or compounded form.