A long time ( Informal ) (5)

I think it could be either:

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yonks

(Other definitions for yonks that I've seen before include "Slangily, a long time" , "Ages (colloq.)" , "Slang for a long time, ages" , "Many years (slang)" , "A very long time (colloq.)" .)

I've seen this clue in The Independent.

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