No single crew has been in the ISS, without other non-radio human contact, for 520 days. In fact, no single person has been in space for that long, period. The

No single crew has been in the ISS, without other non-radio human contact, for 520 days. In fact, no single person has been in space for that long, period. The record at the ISS is 198 days; at MIR, 437[1]. http://en.wikipedia.org/wiki/List_of_spaceflight_records#Ten_longest_human_space_flights http://en.wikipedia.org/wiki/List_of_spaceflight_records#Ten...