40 (number)

40 was a number.

The Trojan Horse was about forty feet tall. (TV: The Myth Makers)

Forty minutes was equivalent to one rev. (AUDIO: The Game)

Arcturus was 40 light-years from Earth. (PROSE: Only a Matter of Time)

Jim Hardwicke's anti-aging drug placed its subjects in a death-like state of unconsciousness for forty years, after which they would wake up fully re-energized. (PROSE: The Living Death)

Behind the scenes
According to The Last Dalek, a video game based on the events of the television story Dalek, Henry van Statten was 40 years old in 2012.