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I really have no idea how often the guards are changed, and it would just be random guesses on my part, but I'll throw out one more guess. Every 21 minutes?
When I was in the Army one of my drill sergeants had been part of the honor guard in Washington, D.C., and I remember him telling us that they had all kinds of rules they need to follow, like they couldn't drink -- for the rest of their lives.
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