CREATE TABLE table_245801_1 (duration__days_ VARCHAR2, crew VARCHAR2)

Name the duration for vladimir vasyutin , alexander volkov
SELECT COUNT(duration__days_) FROM table_245801_1 WHERE crew = "Vladimir Vasyutin , Alexander Volkov"
SELECT COUNT("duration__days_") FROM "table_245801_1" WHERE "Vladimir Vasyutin , Alexander Volkov" = "crew"