Vine's Expository Dictionary of NT Words
Night and a Day
an adjective denoting "lasting a night and a day" (from nux, "night," and hemera, "a day"), is used in 2 Corinthians 11:25 , in the neuter gender, as a noun, the object of the verb poieo, to do, lit., 'I have done a night-and-a-day.'
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Vines, W. E., M. A. Entry for 'Night and a Day'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/n/night-and-a-day.html. 1940.