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			Consistently assessing that a crew is doing their job, " in a manner that doesn't create a delay" is clearly an appropriate objective.  Assuming a specific time interval can be set as an overriding requirement, seems like a dangerous and unnecessary requirement. 
 
There are all sorts of common occurences that can affect that interval;  a slow(er) chain crew, a player an Umpire has decided needs a special word of guidance, a reasonable, appropriate question from a coach to a wing official.  
 
Under "normal" circumstances a specific time interval may be attainable, but the circumstances are what should decide the interval, not the other way around.
		 
		
		
		
		
		
		
		
		
	
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