Orders of magnitude (time)

In the context of time, an order of magnitude is a description of the quantity of a time in respect to comparison between differing magnitudes. In common usage, the scale is usually the base¹⁰ or base⁻¹⁰ exponent being applied to an amount, making the order of magnitude 10 times greater or smaller. As the differences are measured in factors of 10, a logarithmic scale is applied. In terms of time, the relationship between the smallest limit of time, the Planck time, and the next order of magnitude larger is 10.

60 s: 1 minute

2.6 Ms: approximately 1 month
31.6 Ms: approximately 1 year ≈ 10^7.50 s

2.1 Gs: average human life expectancy at birth (2011 estimate)
3.16 Gs: approximately 1 century
31.6 Gs: approximately 1 millennium

6 Ts: Time since the appearance of Homo sapiens (approximately)
80 Ts: Time it takes for light to travel from the Andromeda Galaxy to the Milky Way.
160–220 Ts: Time since the divergence of the human and chimpanzee lineages.

7.1–7.9 Ps: 1 galactic year (225-250 million years)
143 Ps: the age of the Earth
144 Ps: the approximate age of the Solar system and the Sun.
430 Ps: the approximate age of the Universe
440 Ps: the half-life of thorium 232

6.616×10⁵⁰ Ys: Time required for a 1 solar mass black hole to evaporate completely due to Hawking radiation, if nothing more falls in.

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