Block scheduling is a type of academic scheduling in which each student has fewer classes per day. It is more common in middle and high schools than in primary schools. Each class is scheduled for a longer period of time than normal (e.g. 90 minutes instead of 50). In one form of block scheduling, a single class will meet every day for a number of weeks, after which another class will take its place. In another form, daily classes rotate through a changing daily cycle.