Russians set record for longest stay on space station

Chub and Kononenko will add more days to their total before their scheduled return to earth on Monday. 

The 59-year-old Kononenko holds other space duration records, including the most cumulative time in space - 1110 days during the course of five missions by the time he lands in Kazakhstan next week. 

Two American astronauts, Butch Wilmore and Suni Williams, have inadvertently been aboard the space station for much of the Russians' record-setting stay. 

Williams and Wilmore expected to be on the ISS for only eight days when they blasted off in June, but their problem-plagued Boeing Starliner capsule was sent back without them. 

They are set to return in February.