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					Originally Posted by cmathews
					
				 
				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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thanks.  I'm studying to take the officials exam and am attending 2 camps this summer - and I was just looking for a clarification of the rule - I had never heard or seen a request - just what you said - officials usually just wait until everyone is pretty much ready.