Tourists:

Looks like a tie between Dennis Tito and Hazzaa al Mansoori

The source says "6 days aboard ISS"; the chart apparently is for the full mission.

[![enter image description here][1]][1]

Nauts:

Talgat A. Musabayev and Yuri M. Baturin (labeled "Russian politician") stayed the same amount of time as Tito.


Source: https://www.nasa.gov/feature/space-station-20th-space-flight-participants


  [1]: https://i.sstatic.net/EcIUv.png