John Taylor Gatto (and John Holt, and many others) say "wasting time" is the whole point of compulsory education.
https://en.wikipedia.org/wiki/John_Taylor_Gatto#Main_thesis
"Against School: How Public Education Criples our Kids, and Why" - http://www.wesjones.com/gatto1.htm
Archive.org should have the complete text of "The Underground History of American Education", which was formerly posted in its entirety at http://www.JohnTaylorGatto.com
Also search for "I quit, I think", and ... "The Seven Lesson Schoolteacher"... several copies of these essays are scattered around the internet.
Edit: favorite'd your earlier comment, as I like how your teacher was good at teaching physics in spite of not having a congratulatory paper from a "higher education" establishment.