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)

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