I've found the expression "not in a month of Sundays". However, it seems as though this might be a informal expression. Therefore, I would really appreciate it if someone could let me know whether the following expression could be used in formal or academic writing.
He's never going to get that finished in a month of Sundays.
let me know whether the following expression could be used in formal or academic writing. No
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let me know whether the following expression could be used in formal or academic writing. No
dileepain a month of Sundays.
That is very informal.
So are these - that mean once in a very long time, or very infrequently.
Once in a blue moon
Once in a ****'s age