I assume they'll be flying in on CO, in that case will they be checked in at their origination for DUB? Will they have checked luggage? Getting bags over to the DUB flight might be a stretch--better if they only have carry on. The other problem they have to anticipate is even with 'padding' is that getting an arrival gate at that hour may be difficult. It's a very busy time at EWR, and even if their flight lands on time, it's no guarantee it will be at the gate in time to make their connection. Check the arrivals of that flight on several days to make sure. Also, it will help if they are seated in the front of the plane. No way will they make it if they are stuck in row 27, behind a long line of coach passengers all getting luggage down from the overhead bins