1 E16 s

Orders of magnitude (time) in E notation
Planck time 1 E-25 s 1 E-24 s 1 E-21 s 1 E-18 s 1 E-17 s 1 E-16 s 1 E-15 s 1 E-14 s 1 E-13 s 1 E-12 s 1 E-11 s 1 E-10 s 1 E-9 s 1 E-8 s 1 E-7 s 1 E-6 s 1 E-5 s 1 E-4 s 1 E-3 s 1 E-2 s 1 E-1 s	1 E0 s 1 E1 s 1 E2 s 1 E3 s 1 E4 s 1 E5 s 1 E6 s 1 E7 s 1 E8 s 1 E9 s 1 E10 s 1 E11 s 1 E12 s 1 E13 s 1 E14 s 1 E15 s 1 E16 s 1 E17 s 1 E18 s 1 E19 s and more
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To help compare orders of magnitude of different times this page lists times between 10¹⁶ seconds (320 million years) and 10¹⁷ seconds (3200 million years). See also times of other orders of magnitude.

Shorter times
340 million years—time since the beginning of the Carboniferous and the end of Devonian period
400 million years—time since the beginning of the Devonian and the end of the Silurian period
420 million years—time since the first creature took a breath of air
435 million years—time since the beginning of the Silurian and the end of the Ordovician period
500 million years—time since the beginning of the Ordovician and the end of the Cambrian period
540 million years—time since the beginning of the Cambrian and the end of the Precambrian period. Time since the Cambrian explosion and age of the earliest Vertebrates.
575 million years— age of the oldest Animal fossils
580 million years—time since the end of a possible Snowball Earth ice age
600 million years—age of first complex multicelled lifeforms
703.8 million years—half-life of uranium-235
750 million years—time since the beginning of a possible Snowball Earth ice age
1277 million years—half-life of potassium-40
1.8-2.1 billion years—age of the earliest Eukaryotes
2.3 billion years—time since the first known ice age
3.0 billion years—time until the potential Andromeda-Milky Way collision, between the Milky Way and Andromeda galaxies
Longer times

v • d • e Orders of magnitude (time), by powers of seconds

Negative powers	10⁻⁴⁴ s \| ... \| 10⁻²⁵ s \| 10⁻²⁴ s ... 10⁻²² s \| 10⁻²¹ s ... 10⁻¹⁹ s \| 10⁻¹⁸ s ... 10⁻¹⁶ s \| 10⁻¹⁵ s ... 10⁻¹³ s \| 10⁻¹² s \| 10⁻¹¹ s \| 10⁻¹⁰ s \| 10⁻⁹ s \| 10⁻⁸ s \| 10⁻⁷ s \| 10⁻⁶ s \| 10⁻⁵ s \| 10⁻⁴ s \| 10⁻³ s \| 10⁻² s \| 10⁻¹ s

Positive powers	1 s \| 10 s \| 10² s \| 10³ s \| 10⁴ s \| 10⁵ s \| 10⁶ s \| 10⁷ s \| 10⁸ s \| 10⁹ s \| 10¹⁰ s \| 10¹¹ s \| 10¹² s \| 10¹³ s \|10¹⁴ s \| 10¹⁵ s \| 10¹⁶ s \| 10¹⁷ s \| 10¹⁸ s \| 10¹⁹ s and more