We can skip all the busywork,
and we don't waste time.
We are not constrained or regulated as to how many days or instructional hours we must put it, so when we "get" something, we can move on. And we don't have to rush, either, because we don't waste hours every day waiting.
Waiting in lines.
Waiting for other students to finish.
Waiting for the teacher to answer our question.
Waiting for other students to be quiet and pay attention.
Waiting for the teacher to move on to the next thing.
Waiting for recess.
Waiting for lunch.
Waiting for a bell to ring.
Waiting for a bus.