About a billion years

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Possible Answers: Eon.

Last seen on: Daily Celebrity Crossword – 1/29/20 0
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Random information on the term “Eon”:

The word aeon /ˈiːɒn/, also spelled eon (in American English), originally meant “life”, “vital force” or “being”, “generation” or “a period of time”, though it tended to be translated as “age” in the sense of “ages”, “forever”, “timeless” or “for eternity”. It is a Latin transliteration from the koine Greek word ὁ αἰών (ho aion), from the archaic αἰϝών (aiwon). In Homer it typically refers to life or lifespan. Its latest meaning is more or less similar to the Sanskrit word kalpa and Hebrew word olam. A cognate Latin word aevum or aeuum (cf. αἰϝών) for “age” is present in words such as longevity and mediaeval.

Although the term aeon may be used in reference to a period of a billion years (especially in geology, cosmology or astronomy), its more common usage is for any long, indefinite period. Aeon can also refer to the four aeons on the Geologic Time Scale that make up the Earth’s history, the Hadean, Archean, Proterozoic, and the current aeon Phanerozoic.

In astronomy an aeon is defined as a billion years (109 years, abbreviated AE).

Eon on Wikipedia