Have you ever wondered why your classes are so long? If you’re sitting in class, bored out of your mind, wondering who came up with the idea of making the lesson so long, you’re about to find out!

Some people claim that 9-year-old children, for example, can concentrate for an hour. However, according to The Washington Post, physiologically, after just 20 minutes of sitting, the brain starts to receive less oxygen and glucose, which decreases concentration. We're about to tell you how class duration was determined and about the intense debate surrounding class timings, which started centuries ago and is still raging!

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