Carr, Gibson and Pogue
The third manned Skylab mission, the third and final crew to the first space station, lifted off November 16, 1973. The crew, Commander Gerald P. Carr, Science Pilot Edward G. Gibson and Pilot William R. Pogue, spent 84 days in space, the longest period at that time.
During the mission, the crew complained they were being pushed too hard, being made to work long hours without sufficient rest. NASA thought they weren't working hard enough or efficient enough. On New Year's Day 1974, the crew, fed up with their work schedule, turned off their communications and enjoyed the view of Earth for a day. NASA did not find that even remotely funny, but their work schedule was modified and the crew completed more work than scheduled.
Part of their mission was to make observations of Comet Kohoutek.