not in a month of Sundays
If you say that something will not happen in a month of Sundays, you mean that it is very unlikely to happen:
He's never going to get that finished in a month of Sundays!
Thesaurus: synonyms and related words
Long periods of time
- -athon
- aeon
- age
- donkey
- donkey's years idiom
- eon
- epoch
- era
- eternity
- good
- month
- yonks
You can also find related words, phrases, and synonyms in the topics:
Always & never