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The spacecraft and crew of the Soviet Soyuz 17 mission returned to earth after 29 days in orbit at the Salyut 4 station.
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Soyuz 17
Crewed flight of the Soyuz programme
Soyuz 17 was the first of two long-duration missions to the Soviet Union's Salyut 4 space station in 1975. The flight by cosmonauts Aleksei Gubarev and Georgy Grechko set a Soviet mission-duration record of 29 days, surpassing the 23-day record set by the ill-fated Soyuz 11 crew…Source: Wikipedia (CC BY-SA)
Salyut 4
Soviet space station (1974–1977)
Salyut 4 was a Salyut space station launched on December 26, 1974 into an orbit with an apogee of 355 km, a perigee of 343 km and an orbital inclination of 51.6 degrees. It was essentially a copy of the DOS 3, and unlike its ill-fated sibling it was a complete success. Three…Source: Wikipedia (CC BY-SA)