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)

Bernice Summerfield celebrated her thirtieth birthday on the planet Heaven. (PROSE: Love and War)

Thirty years prior to 2005, the Ninth Doctor visited a school in Surrey to teach a painting class. (PROSE: Have You Seen This Man?)

When Giles talked to a camera about P.R.O.B.E. and leads in a case regarding an upcoming perihelion, the number 30 was presented under the aspect ratio. (WC: Out of the Shadows) Chronon, (WC: 14682 UNIT Field Log, 14683 UNIT Field Log, 14684 UNIT Field Log) or cronon (WC: 14681 UNIT Field Log) and artron energy readings during the recording of UNIT field logs included 17%, (WC: 14682 UNIT Field Log) 18%, 19%, (WC: 14681 UNIT Field Log, 14682 UNIT Field Log) 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, 36%, 37%, 38%, 39%, 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, (WC: 14682 UNIT Field Log) 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, (WC: 14682 UNIT Field Log, 14684 UNIT Field Log) 90%, (WC: 14682 UNIT Field Log, 14683 UNIT Field Log) 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%, 101%, 102%, 103%, 104%, 105%, 106%, and, in the case of Chronon energy, 107%. (WC: 14683 UNIT Field Log)

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.