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donkey's years很长一段时间。这个习语最早的说法是donkey's ears，为同韵俚语（rhyming 
slang），以与years押同韵的donkey's ears来比喻时间，后来才改为donkey's years。这是因为驴子很长寿，且用years更能点出“时间”的概念。
看看老外聊天时怎么用donkey's years：
Molly: Blake? My God! It really is you.
Remember me? I'm Molly.
Blake: Molly! I don't believe it! I'm so happy!
Molly: I was pretty sure it was you when I saw you from the back.
Blake: How are you? I haven't seen you in donkey's years.
Molly: I'm doing fine. How about having dinner together?
莫莉：是布莱克吗？天哪！真的是你，记得我吗？我是莫莉。
布莱克：莫莉！太不可思议了，我真高兴！
莫莉：光看到背影，我就非常确定是你了。
布莱克：你过得好吗？我好久没看到你了。
莫莉：我很好，一起吃顿晚餐如何？
donkey's years例句精选：
I've been a vegetarian for donkey's years.
多年以来我一直是个素食者
She's been there donkey's years.
她已在那儿待了好多年。
He introduced me to a friend he'd known for donkey's 
years.
他把我介绍给一位他已认识多年的朋友。
You could once get a glass of beer for ten cents; but that was donkey's years ago.
过去人们用十美分就买得到一杯啤酒，不过那是很久以前的事了。
拓展学习：
long-winded 
冗长的
extended 长期的；延伸的
eon 极长的时间
coon's age 很长一段时间
a month of Sundays 很长的时间
in a snap 顺刻之间
