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Phrase(s): It’ll be a long day in January when something happens.
Rur. Something will never happen. (There are fewer hours of daylight in January.) • Tom: Maybe this will be the year that Mama treats herself to a nice vacation. Jane: Are you kidding? It’ll be a long day in January when she does that! • It’ll be a long day in January when that car dealer gives an honest price.
McGrawhill's American Idioms And Phrasal Verbs