12 hours
In ancient times, the Chinese Zodiac was used to record the year, and the stem branch was used to count the time, which was only after the Han Dynasty. According to the rising time of the sun, the ancients divided a day and night into twelve hours, using twelve earth branches as codes for easy memorization. China uses the land branch timing method, which is called twelve hours ("Da Shi"), that is, what we now call 24 hours.
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