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1000000000 was a number.
During his ordeal in the confession dial, two successive copies of the Twelfth Doctor respectively believed that they had travelled "nearly a billion" and "well over a billion" years into the future. (TV: Heaven Sent)
By the 1970s, the Nestene Consciousness had been colonising planets for "a thousand million years." (TV: Spearhead from Space)
At the time of its disappearance, Bandraginus V had a population of "a thousand million." (TV: The Pirate Planet)