An hour was a unit of time, 24 of which typically composed one day on Earth. (TV: Last of the Time Lords)

The Fifth Doctor once retrieved the Key to Time in less than one galactic hour. (GAME: The First Adventure)

According to Ashildr, ten thousand hours was all it took to master any skill and, after over a hundred thousand hours, one became the best there had ever been. (TV: The Woman Who Lived)

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