After I (barely) graduated from college with an engineering degree, I got hired by an engineering firm. It soon became apparent to me that my supervisor had no intention to give me any work. They were a government consulting company and so they were getting paid for every hour I supposedly worked and they were fine just keeping me on the books. I would come into work at 10AM, do nothing for five hours and leave at 3PM. Went on for about two years. I was super into my extra curricular activities, so I didn't mind at the time. But for me it was very unhealthy mentally to not be productive like that. Even now I'm aware at my current job working from home, that when my work slows down, I don't feel as good about my life as when I am productive at work.