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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 base^{10} or base^{−10} exponent being applied to an amount, making the order of magnitude 10 times greater or smaller.^{[1]} 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)^{[13]} 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.^{[14]} 160–220 Ts: Time since the divergence of the human and chimpanzee lineages.^{[15]}
7.1–7.9 Ps: 1 galactic year (225-250 million years)^{[17]} 143 Ps: the age of the Earth^{[18]}^{[19]}^{[20]} 144 Ps: the approximate age of the Solar system^{[21]} and the Sun.^{[22]} 430 Ps: the approximate age of the Universe 440 Ps: the half-life of thorium 232
6.616×10^{50} Ys: Time required for a 1 solar mass black hole to evaporate completely due to Hawking radiation, if nothing more falls in.
The pages linked in the right-hand column contain lists of times that are of the same order of magnitude (power of ten). Rows in the table represent increasing powers of a thousand (3 orders of magnitude).
Conversion from year to second is year × 31 557 600 (approximately \pi * 10^7) using the Julian year. Conversion from \log_{10} \mbox{ year} to \log_{10} \mbox{ second} is approximately \log_{10} \mbox{ year} + 7.50. Example conversion; 1 \mbox{ year} =10^0 \mbox{ year} = 10^{0+7.50} \mbox{ seconds } = 10^{0.50 + 7} s = 3.16 * 10^7 s.
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