not/never in a hundred, etc. years

not in a million years

Not at any point; under absolutely no circumstances. Not in a million years did I think that I would actually win the lottery! A: "Do you think Samantha will agree to go on a date with Jake?" B: "Not in a million years!"
See also: million, not, year

not/never in a hundred, etc. ˈyears

(spoken) used to emphasize that you will/would never do something: I’d never have thought of that in a million years.
See also: never, not, year