- Shorter times
- 63 years -- half-life of titanium-44
- 68.9 years -- half-life of uranium-232
- 75 years -- average human life span
- 84 years, 3 days, 15.66 hours -- one orbit of Uranus
- 100 years -- one century = 3.16 × 10
^{9}seconds - 165 years -- one orbit of Neptune
- 247.7 years -- one orbit of Pluto
- 288 years -- one orbit of Quaoar
- Longer times