I recall one time waking up on a Sunday at 8AM. I went about my day doing whatever it was I had to do that day including splitting a cord of wood. Then I went to work from 12AM to 8AM the next morning (24 hours). The next morning when I got off work, I went to school. I was a college student too. I attended class until around noon. Then ate a meal and did some studying. I went to work the next day from 4PM to 12AM (40 Hours). Then I had an opportunity to cover an overtime shift until 8AM and did so (48 hours). Next, I covered another shift until Noon (52 hours). When that was over, I went home and bed. I believe I slept the next 12 to 16 hours. I estimate I was awake 54 hours over the course of a three day period.