Well, I'd imagine the 3 shifts are pretty set, due to habitable space design. So X / 3 = watch duration 24 / 3 = 8 hours, which does seem long to be kept on h

Well, I'd imagine the 3 shifts are pretty set, due to habitable space design. So X / 3 = watch duration 24 / 3 = 8 hours, which does seem long to be kept on hair trigger while performing physically and/or mentally taxing tasks. I'd like to think the military did studies on performance with respect to watch duration. Or they could have just pulled them out of a hat. Also, it seems like they might have indeed switched to 8-hour shifts: https://en.m.wikipedia.org/wiki/Watchkeeping#US_submarine_system_with_three_sections https://en.m.wikipedia.org/wiki/Watchkeeping#US_submarine_sy...