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To help compare orders of magnitude of different times this page lists times between 3.2 million years and 32 million years (10¹⁴ seconds and 10¹⁵ seconds) See also times of other orders of magnitude.

• Shorter times

• 4 million years—estimated average lifetime of biological species
• 4.32 million years- one mahayuga, or 12,000 divine years, in Hindu mythology

Elapsed time

• 4 million years—time since beginning of last ice age
• 4.5 million years—approximate age of the genus Australopithecus
• 5 million years—time since beginning of Pliocene Epoch
• 5 million years—time since end of Miocene
• 5.5 million years—approximate age of the genus Ardipithecus
• 5-7 million years—estimated age of the Pan/Homo split
• 18-12 million years—estimated age of the Hominidae family
• 20 million years—time since the first forms of grass appeared
• 24 million years—time since beginning of Miocene Epoch
• 24 million years—time since end of Oligocene Epoch
• 26 million years—time since the emergence of the first true elephants.

Half lives

• 3.74 million years -- half-life of manganese-53
• 4.2 million years -- half-life of technetium-98
• 6.5 million years—half-life of palladium-107
• 15.6 million years—half-life of curium-247
• 23.42 million years -- half-life of uranium-236

• Longer times