donkey's years

Etymology
1876 or earlier. Possibly chosen because donkeys can be long-lived animals. Despite the similarity, pre-dates and likely not directly related to, a less frequently used term for.

Noun

 * 1)  A long time, years and years.
 * 2) * 1876, :
 * Didn't you ask him how long it had been in his possession? I can't recollect that. I might have done so. Didn't he say for years and years and donkey's years?