Longest uninterrupted human presence in space

There have been people in space at all times since the launch of Soyuz TM-31 – carrying the first resident crew of the International Space Station – on 31 October 2000. The development of the continuously occupied International Space Station, and the operations required to keep it crewed and supplied, means that it has been 18 years 337 days (as of 2 October 2019) since every human being was on Earth at the same time.