How big should the secret service perimeter around a person they protect be?

Realistcally, how big should the security permiter be for not allowing unauthorized people to be near someone the Seceret Service is protecting?

100 yards
300 yards
500 yards
1/2 mile
1 mile
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realistcally, can the SS control who goes in and out in a one mile wide perimeter around Mara Lago?
How big should the secret service perimeter around a person they protect be?
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