ANSWERS: 1
  • At one stretch, the cosmonaut Dr. Valeri Vladimirovich Polyakov spent 437.7 days aboard Soyuz TM-18 (1994 -1995). Accumulated, the cosmonaut Sergei Vasilyevich Avdeyev (1956- ) has spent the longest time in space; he logged 747.6 days on 3 flights from 1991-1999. In second place is Dr. Valeri Vladimirovich Polyakov (678.7 days on 2 flight). In third place is Anatoliy Yakovlevich Solovyov (651.0 days on 5 flights). In fourth place is Sergei Konstantiovich Krikalyov (624.4 days on 5 flights). Not sure how up to date those figures are, http://www.enchantedlearning.com/explorers/spacefirsts.shtml

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