I would put a small safety hole if the duckling doesn't pip in the next few hours as a precaution, this late after internal piping it shouldn't hurt anything if done correctly. Chirping back might encourage them to pip too.
Here is great link regarding assisted hatching-
https://www.backyardchickens.com/articles/guide-to-assisted-hatching-for-all-poultry.72886/
	
		
			
		
		
	
				
			Here is great link regarding assisted hatching-
https://www.backyardchickens.com/articles/guide-to-assisted-hatching-for-all-poultry.72886/
	
 thank you
, I would go ahead and put a small safety hole , twist very gently back and forth with a screw tip on the Aircell, do not make the hole to big. Oxygen in the egg runs out around twenty-four hours,  I would put a safety hole in your other eggs if they don't pip within the next few hours.
Best advise since it’s been 24 hrs.