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Millisecond is equal to 10-3 second (unit of time), comes from a combination of the metric prefix milli (m) with the second (s). Plural name is milliseconds.
An hour (symbol: h; also abbreviated hr.) is a unit of time conventionally reckoned as 1⁄24 of a day and scientifically reckoned as 3,599–3,601 seconds, depending on conditions.