Interesting question. What makes a day on Io ? Is it having the sun in the sky, or having Jupiter in the sky ? And would that choice make a difference in the best answer ? I'll take the easy way out: Io's rotation on its axis is in sync with its period of revolution around Jupiter. Both are = 1.769 earth days = approx. 42hours 27.5minutes
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If you mean "how many hours are IN one day", then there are 24 hours in a day.
24 hours are in one day...:)
There are 24 hours in a day.
There is 24 hours in 1 day!!
24 hours a day