Time for Earth to make a complete rotation on its axis(noun)
WordNet. Princeton University. 2010.
Use "twenty-four hours" in a sentence
"My mother keepsHeadline News on pretty much twenty-four hours a day."
"As a result of these quick-response data-gathering methods, Deutschmann and Danielson were able to begin telephone inter viewing about twenty-four hours after the news event."
"A Days Inn promised a guitar-shaped pool and Elvis movies on demand, twenty-four hours a day."