I don't have hard numbers, but I wold like to point out that Japanese students spend more days per year and longer hours in school, as well as hours of cram school on top of it for most of them, than Canadian schools, and yet Canadian students overall end up ranked higher on than Japanese students on every ranking I've ever seen.

Canadian schools also spend more than $3000 per student per year on average than American schools.

What American schools need is more quality, not more quantity.