I like self directed learning. It has always been possible but in the 20th century it was frowned upon by most school systems. As a result most people think that if you are not in a classroom you are not learning. Today when people talk about online education the argument is made that you either have to go one way or the other. Why not both?
If a high school of 2000 students with an average commute of 30 minutes (60 both ways) made Wednesday self directed learning day the time saved would be roughly 3 months of human time. This is awesome. Each week the school would save 3 months of human time and each month it would roughly save a year of human time.
Students could do whatever they want with their time. They could learn something new, play sports or just relax. Yes, even relaxing can help learning.
So when you talk about self directed learning you can say that even one day of self directed learning a week has massive gains.