From what I can tell, quite often. We cruised about a year ago and it looks like menus have changed at least twice in that year. Some things seem very consistant.
I think they tweak the menu a bit from time to time, but it seems to me like the choices remain somewhat the same. They may pull an item or two and add some new ones, but I remember the menus being basically about the same on all of our cruises.
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