I've stayed up two days in a row but I can't handle any longer.
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So far worst was 70 hours, I was the maneuvering watch during midi ops. Boat decided to go on 8 hour schedule as an experiment, problem was that my sleep time was during the time I had to be in the bridge. Finally got sent to the rack while I was on watch and captain happened by realized I was on watch still and had my chief get me a bit of downtime to sleep.