It'll be a long day in January

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.
See also: January, long