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You will normally be expected to leave sometime early morning, but they may let you stay on later as you have a late flight but they do have to get the ship ready for the next cruise, this is the same for most cruise companies.
The ships arrive in port around 6 to 8 a.m. and disembarkation starts as soon as custon clearance is completed. Some cruise lines book you into a day hotel near the airport when it is this late departure so you would need to check if this is the case failing that you have a long wait. Worth looking out for a bus trip to see the highlights before going to the airport that does help pass the time a bit, but it might not be available this is a fairly new idea.