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In an exceptionally long period of time. The phrase likely originated as the rhyming slang, shortened to simply "donkeys," of "donkey's ears" —where "ears" rhymes with "years" and alludes to the length of a donkey's ears. I haven't seen Jim in donkeys! How's he doing these days?
See also: donkey
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.