During the six Apollo spaceflights , how many men walked on the Moon ?
The longest period of continuous human presence in space is on the International Space Station , exceeding the previous record of almost 10 years ( or 3,634 days ) held by Mir , spanning the launch of Soyuz TM-8 on 5 September 1989 to the landing of Soyuz TM-29 on 28 August 1999 .