Random triples
| Subject | Object |
|---|---|
| gptkb:Skylab | about 171 days of crewed research |
| gptkb:Skylab | up to 84 days per crew |
| gptkb:Space_Station_BSL | up to 6 months |
| gptkb:Severny_Island_research_station | seasonal expeditions |
| gptkb:X-29_experimental_aircraft | 8 years |