Hour

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

The space hour was used by the Tyrryxians. (COMIC: Size Control)

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)

Met by Sunday Mirror journalist Vivien Rook at 10 Downing Street, First Lady Lucy Saxon rhetorically asked if she could have an hour to herself, however, she was convinced to give a 20 minute interview. (TV: The Sound of Drums)