How many hours in a complete day?

Question: Did you know how many hours we have in day? 
or 
Question: How many hours in a complete day? 
or 
Question: How many hours actually in day? 
or 
Question: Are all days exactly 24 hours?
or
Question: How many hours in a day?

Answer: A complete day is twenty three hours, fifty six minutes and four thousand seconds. that is, 23:56:4000 (hh:mm:ss)