noun
a coon's age - a colloquial expression meaning a very long time
preposition
in - used to indicate inclusion within something
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I haven't seen her in a coon's age, it must have been years since our last meeting.
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I haven't talked to him in a coon's age, we really need to catch up soon.
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I haven't hung out with them in a coon's age, we used to be so close.
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The last time I visited that town was in a coon's age, it feels like a distant memory now.