The truth is that most people regardless of education and job don't realize how they utilize the 168 hours per week that we all get to split between sleep, work, eating and leisure. When I used to teach, I had students give me the excuse all the time that they didn't have enough time to complete the assignment. I would ask others in the class how long they spent on average and then ask the students making the excuse to give me a rough breakdown of how they spent their last 168 hours. After account for sleep, other classes, other work, meals and liesure, they would routinely be unable to account for about ~40 hours. Most hours are squandered.