Overlearning is a conscious choice.

When you have given yourself a timebox and finished successfully before the end of it, you can spend the remaining term learning even more.

The flip side is this choice: To over-fail.

When you notice in the timebox that you are failing, you could choose to lean into that hard. Choose to fail and fail in many creative ways.

That will be a different kind of learning.
And the next timebox will be richer for it.