Because if it were only 30 minutes, it would only be a half hour.
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Sixty minutes is the equivalent to an hour. One hour will equal sixty minutes everywhere on planet earth. Sixty minutes is also equivalent to one twenty-fourth of a day.
An hour is sixty minutes. A quarter hour is fifteen minutes.
Babylonians
Sixty-nine of an hour refers to 69 minutes, which is one hour and nine minutes. Since there are 60 minutes in an hour, 69 minutes exceeds the standard hour by 9 minutes.
Sixty (60), same as a civilian hour.