Question: What was the average time spent on the ISS by a typical expedition crew?
About the article "NASA", section "International Space Station (1993–present)".

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Soyuz TMA-8 was a transport mission for portions of the International Space Station (ISS) "Expedition 13" crew.
The flight delivered ISS Commander Pavel Vinogradov and ISS Flight Engineer Jeffrey Williams to the station to replace "Expedition 12" crew members.
Flight Engineer Marcos Pontes joined the TMA-8 crew for the ascent and docking with ISS, spent approximately seven days aboard the ISS conducting experiments, then returned to Earth with the outgoing members of "Expedition 12" aboard Soyuz TMA-7.
Vinogradov and Williams were joined on their return trip to Earth by Spaceflight Participant Anousheh Ansari who launched aboard Soyuz TMA-9 and spent approximately eight days aboard ISS conducting experiments for the European Space Agency. 
Soyuz TMA-7 () was a transport mission for portions of the International Space Station (ISS) "Expedition 12" crew launched October 1, 2005.
The flight delivered ISS Commander William McArthur and ISS Flight Engineer Valery Tokarev to the station to replace "Expedition 11" crew members.
Spaceflight Participant Gregory Olsen joined the TMA-7 crew for the ascent and docking with the ISS, spent approximately eight days aboard conducting experiments, then returned to Earth with the outgoing members of "Expedition 11" aboard Soyuz TMA-6.
McArthur and Tokarev were joined on their return trip to Earth by Flight Engineer Marcos Pontes who launched aboard Soyuz TMA-8 and spent approximately seven days aboard the ISS conducting experiments for the Brazilian Space Agency. 
Expedition 22 was the 22nd long duration crew flight to the International Space Station (ISS).
This expedition began in November 2009 when the Expedition 21 crew departed.
For a period of 3 weeks, there were only 2 crew members; it was the first time that had happened since STS-114 had delivered a third person to restore the ISS crew to 3.
Commander Jeff Williams and flight engineer Maksim Surayev were joined by the rest of their crew on 22 December 2009, making the Expedition 22 a crew of five.
The expedition ended when Soyuz TMA-16 undocked on 17 March 2010, and was immediately followed by the start of Expedition 23. 
Expedition 5 was the fifth long-duration stay on the International Space Station (ISS).
The crew, consisting of three people, remained in space for 184 days, 178 of which were spent aboard the ISS.
Expedition 5 was a continuation of an uninterrupted human presence in space, as of March 2011, which was begun by Expedition 1 in 2000-2001.
The crew of Expedition 5 launched to space aboard the Space Shuttle "Endeavour" aboard the STS-111 mission on 5 June 2002.
Their tenure aboard the station, however, did not occur until they docked with the ISS two days later on 7 June. 
Expedition 35 was the 35th long-duration mission to the International Space Station (ISS).
The expedition started 13 March 2013, and marked the first time a Canadian astronaut – Colonel Chris Hadfield – was in command of the station.
Expedition 35 was also only the second time an ISS crew is led by neither a NASA astronaut, nor a Roscosmos cosmonaut, after Expedition 21 in 2009, when ESA astronaut Frank De Winne was in command.