The most frustrating part of using time for learning is the “pending” status of his work. Some of the time, the grade is automatic, and that makes it easy to know if he’s ready to move on to the next lesson. But when he finishes a lesson and gets the dreaded “pending” instead of a grade, we can loose track, then review much later and see he had lessons he needed to redo. Then we have to go back and redo a lot of stuff after the fact.