Select the most appropriate meaning of the given idiom.

Donkey's years

A very long time

The most appropriate meaning of the idiom "donkey's years" is >A very long time.<

This idiom is used to describe a period of time that is very long or indefinite. It is often used to describe something that happened a long time ago or something that will take a long time to happen. The idiom is thought to have originated in the 16th century, and it is believed to refer to the long lifespan of donkeys.

The other options are not correct.

• A stupid argument is not the same as donkey's years.
• A worthless person is not the same as donkey's years.
• Futile effort is not the same as donkey's years.