Well, the verdict is in...
9 days on a cruise ship with unlimited food (and booze for that matter) and I ended up weighing in at the exact same as I left, 251lbs! I actually really didn't eat that much.
I'm really happy about that! I think the day and a half of food poisoning (day 6/7) also saved me!
There was stuff coming out of every orifice that day and a half!!
My coaches say I'll need 3 days to get back into ketosis. Already, I'm feeling much better as I'm back into my P1 "routine".