Crossword Genius

Long stretch of time (3)

Ross

I believe the answer is:

eon

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

This is the entire clue.

(Other definitions for eon that I've seen before include "billion years" , "Major division of geological time" , "plenty of time" , "Very long period (US and technical spelling)" , "Immense period" .)

I've seen this clue in the USA Today, The Washington Post Sunday, the Wall Street Journal, the Newsday.com and The New York Times.
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