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As the others have said, I don't think there is a set time. I like JRut have never had the request. When we have "mass" substitutions, as an official you can tell when they are matched up. I just delay putting the ball in play until it appears they are matched up.
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The officials lament, or the coaches excuses as it were: "I didn't say it was your fault, I said I was going to blame you"
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