"When is the break?"
Канікили are also often referred to as "break," with a slightly different understanding from перерва. Summer vacation, winter vacation, in the context of school not being in regular session, are also called summer break, winter break. So канікули translated as "break" should not be marked wrong, even though перерва, a "break" between classes is a different idea. Also along these lines are "spring break" more common than "spring vacation/holiday," which are definitely канікули rather than перерва.