Do not try and cut it close. On our recent Norwegian Jewel cruise a group of passengers missed the departure from Juneau, and had to hire a boat (at their own expense) to chase down the Jewel at Sawyer Glacier. Big bucks!
It is my understanding that if you book an excursion through the ship, they will wait if the excursion is late (the Jewel held for more than an hour in Skagway after the train derailment stranded a number of passengers). If you book independently, you are on your own.
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