When considering things logically, humans are often bound by emotion.
Feelings of lethargy, or mental fatigue—perhaps depression and other negative states—tend to get in the way of productivity.
Objectively, humans could function for twelve straight hours—being productive throughout, as long as they had the sustenance and the barest minimum of rest to keep them going.
Eight hours of sleep, then four hours embedded in chunks between the twelve hours of constant productive work. These four hours would include feeding, excretion, resting, and the likes.
Every day. All day. Humans could achieve so much if they dedicated twelve hours of their time to their task.
But… that is rarely the case with people.
How much smarter would the average student be if they constantly dedicated twelve hours to their studies for the years they spent in school?
But, more often than not… they do not do this.
