How many hours are in a day?
Answer24
A day has 24 hours.
Challenge · Facts & stats
Hour facts & stats
7 fact-checked facts about hours, timekeeping and making the most of time, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What device uses flowing sand to measure time?
AnswerHourglass
Sand trickles through the narrow neck of an hourglass.
Going deeper
How many hours are in a week?
Answer168
7 days times 24 hours equals 168.
How many degrees of longitude roughly equal one hour of time difference?
Answer15
360 degrees divided by 24 hours is 15 degrees.
Which ancient civilization is credited with dividing day and night into 12 parts each?
AnswerAncient Egyptians
Egyptian timekeeping led to the 24-hour day.
Expert level
What is 'Big Ben' officially?
AnswerThe great bell in London's Elizabeth Tower
Big Ben is the nickname of the Great Bell.
Which international time standard replaced GMT for most scientific use?
AnswerUTC
Coordinated Universal Time is kept by atomic clocks.
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