average time to dedicate to a class
If students can only focus for 15-minute intervals, shouldn't we devote precious class time to something more engaging? Each school day, millions of students move in unison from classroom to classroom where they listen to 50- to 90-minute lectures. Despite there being anywhere from 20 to 300 humans in the room, there is little actual interaction. This model of education is so commonplace that we have accepted it as a given.