Crossword Genius

Extremely long time (3)

Ross

I think it could be either:

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3

4

eon

'extremely long time' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for eon that I've seen before include "An immense time" , "Vast age; eternity" , "In time, long division" , "Age, epoch" , "thousand million years" .)

I've seen this clue in the USA Today, the Penny Press and the Newsday.
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