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					Originally Posted by bob jenkins  Agreed with all of Camron's answers, but if the clock doesn't show tenths and shows 0:01, then you might need to allow up to two seconds before you blow your shistle.  The 0:01 could really be anywhere from 0:01.0 to 0:01.9 | 
	
 Or even 0:00.1 to 0:01.9....as there are some clocks that display a time that is rounded up and some that display a time that is rounded down.