I've run into this a couple of times; you must assume the sailing time on the itinerary is correct and the dive time will be less. The cruise line will notify you of any change in the itinerary--ports, or times of arrival or departure.
You could call NCL to check but I'm sure the error is in the shore excursion time.
Yes, the ship will wait if there is an unforseen delay, but this is just a clerical error.
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