Hit Me: Repeat to Remember

A man plays blackjack with a woman. He eventually gets her phone number and the order to call her. The man attempts to repeat her phone number, but other numbers in the background distract him.

A voiceover discusses the limits to short term memory, and a rule: repeat to remember.

Author John Medina states that if you repeat something within thirty seconds that your brain will hold on to that information for 1-2 hours. Do you support his view? Why or why not? What empirical evidence would convince you of the repeat to remember rule?