CREATE TABLE table_70279 ("Start Date/Time" TEXT, "Duration" TEXT, "End Time" TEXT, "Spacecraft" TEXT, "Crew" TEXT)

What is the duration of the Expedition 20 ISS Zvezda?
SELECT "Duration" FROM table_70279 WHERE "Spacecraft" = 'expedition 20 iss zvezda'
SELECT "Duration" FROM "table_70279" WHERE "Spacecraft" = 'expedition 20 iss zvezda'