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Clock is a time unit. About 1/24 days. Within hours can be divided into smaller units of time. About 60 hours or 3600 seconds. In addition to being a unit of time, hours may be for a time, for example, the sun rises around 6 o'clock and swings around at 6 o'clock. The term word can also be used to refer to items or devices that show time. For example: a watch or watch, a watch clock, etc.