Human cultures vary from region to region and the length of each school day depends on many factors, among which we find culture, language, and values. Which isn't to say one system is necessarily better than the next, but we humans tend to sort things in ranks for comparison.

But to go back to the main question, we often find meaning and philosophical views that are at the core of a culture by observing and analyzing its social structures, education being only one part of an intricate system. That being said, the way we view education often says a lot about the behaviours that are prioritized within that culture.

Ultimately, comparing the length of school days requires examining that point of data in the context of each country and with a nuanced approach in order to avoid biases (ethnic or otherwise) as much as is humanly possible.
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