My best guess would be around 7:30-8. You need to get off the ship which depends on when you are allowed to get off (color tags and number). Then you need to find your luggage (and porter if you have too much of it), get throught customs and then out the door. It isn't as bad as other European cities to leave from. Have a blast!
Mariner-05/06 & 10/09
Oasis Inaugural Cruise-12/09
Monarch-03/10 & 07/10
Mariner; RSS- 10/12
Booked:Celebrity Infinity, 05/15/2015