What are the odds of any number showing up 4 times in a row on a roulette table?

On a double-zero game, once every 2,085,136 spins. As a matter of fact, I saw it happen once, not with one croupier, but with three separate dealers. I was a pit boss at Bill's Lake Tahoe Casino when dealer A spun the number 25. After making his payoffs he went on his break and dealer B stepped in to spin 25 twice consecutively. She was relieved to go home for the evening, then dealer C immediately twirled 25 again. A sleuth roulette player would have immediately jumped on this game, figuring it was a biased wheel in need of repair. In this instance it was hardly worth mortgaging the house. Single-zero never appeared again over the next seven hours of my shift, nor were any of the numbers in its wheel section coming up with abnormal frequency.

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