Sergei Avdeyev is a Soviet/Russian cosmonaut, selected in 1987, who, until Aug 2005, held the record for the longest total time spent in space – 747 days. This was accumulated during three stays aboard Mir: 27 July 1992 – 1 February 1993 (188.9 days), 3 September 1995 – 29 February 1996 (179.1 days), and 13 August 1998 – 28 2 February 1999 (379.6 days). On these missions, Avdeyev carried out 10 spacewalks lasting a total of 42 hours. On 16 August 2005, he was surpassed by his compatriot Sergei Krikalev as the longest-duration spacefarer.