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To help compare orders of magnitude of different times this page lists times between 3.2 years and 32 years (108 seconds and 109 seconds). See also times of other orders of magnitude.
- Shorter times
- 4 years—full term of the President of the United States; (roughly) an Olympiad.
- 4.37 years—the length of time for light from Alpha Centauri to reach Earth
- 4.6 years—orbital period of Ceres
- 5 years—maximum length of a term in the British Parliament
- 6 years—full term of a Senator in the United States
- 7 years—the interval between leap seconds on December 31, 1998 and December 31, 2005, the longest one as of 2009[update]
- 10 years—one decade = 3.16 × 108 seconds
- 11 years -- sunspot activity cycle (7.5 to 11 years)
- 11.87 years—one orbit of Jupiter
- 12 years—length of one cycle through the Chinese zodiac (Terrestrial branch)
- 12.27 years—duration of Nazi Germany
- 13 years—typical time to complete K-12 education in the United States.
- 15 years—age at which one is first eligible to receive a driver's license in New Zealand.
- 16 years—usual age at which one is first eligible to receive a driver's license in most States of the United States.
- 18 years/567.9936 megaseconds/567,993,600 seconds—age at which (in the United States) one is legally permitted to vote, sign contracts, and to use tobacco products.
- 18.03 years -- Saros cycle, the period of solar eclipses and lunar eclipses
- 19.0002 years—235 months (1 Metonic cycle)
- 19.713 years (7200 days) -- one katun in the Mesoamerican Long Count calendar
- 21 years—age at which one can consumer alcoholic beverages in the United States.
- 29 years—recorded maximum lifespan of a dog
- 29.458 years—one orbit of Saturn
Half lives
- 3.3 years -- half life of rhodium-101
- 5.2714 years—half life of cobalt-60
- 13.08 years—half life of californium-250
- 16.13 years—half life of niobium meta state Nb-93m
- 29.1 years—half life of curium-243
Elapsed times
- 18 years -- times since the dissolution of the Soviet Union
- 20 years -- time since the fall of communist governments in Poland, Hungary, East Germany, Bulgaria, Czechoslovakia, and Romania
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