I believe that Captain Knute left early one day by maybe 1/2 hour, but he came on to announce that all were back onboard.

Conversely, we were late leaving another day because one couple were not accounted for. The captain came on several times before our scheduled departure to ask that the passengers in question please contact the desk and let them know they were on board. (They weren't) They finally did show up exactly at the time we were supposed to set sail. We were only about 10-15 minutes late setting sail. (for those who haven't sailed yet, all are expected back on board 1/2 hour before the ship sets sail.)