Embdens will definitely take a day or two longer.  Never had a gosling hatch at 28 days. 30-31 days is more typical.  I use a still air styro incubator for hatching.  At day 28, I will move over to that bator, then use a stethoscope to listen for clicking sounds.  That is when internal pipping complete.  Only after internal pipping will I raise humidity to 75%.
	
		
			
		
		
	
				
			
	
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Can't wait!