1. Donkey's years = a very long time
Example: She’s been in the same job for donkey's years.

2. Till/until the cows come home = for a very long time
Example: I could sit here and argue with you till the cows come home, but it wouldn't solve anything.

3. Forever and a day = An exceptionally long period of time.
Example: Jim, how you been? It's been forever and a day since I last saw you!
 

4. Forever and ever = for now and all time in the future: used for emphasis, especially by children or in children’s stories
Example: He promised to be her friend forever and ever.

5. In/through all the years = during the whole of a stated period of time
Example:I've never once seen her angry in all the years I've known her.

6. For all time = always
Example: I will love you for all time.

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