30 (number)

30 was a number.

After the War Chief started to reduce the dimensions on the SIDRAT the Second Doctor, Jamie McCrimmon and Jeremy Carstairs he told them they had thirty seconds to live before they were crushed to death. (TV: The War Games)

Behind the scenes
According to NOTVALID: The Last Dalek, a video game based on the events of TV: Dalek, both Polkowski and Simmons were 30 years old in 2012.