Three hours of classes per day for six days a week have been carefully crafted, keeping in mind several factors. We believe that this is an optimum structure and offers a host of related benefits. In a traditional school, the school time includes recess and lunchtime. It also includes many other periods which we believe can be reduced or removed from the weekly time-table. For example, the Library period, sports period, GK Period are not included in the 21K School time-table.