108 nights once and 111 nights once (2 World Cruises with 55 ports each in 6 continents ) and another 90 day (South America circumnavigation). We LOVED it and did them at a great time in our life. On our World Cruises they were on fewer passenger ships and everyone is away from their families and the full WCers become like a family and many have become lifelong friends. We had someone living with us who could take care of our pets and would send emails and pictures almost daily plus we had lots of free phone time so could call our grown children often.
I don't think I could do it now, with 4 little grandchildren we would miss their hugs way too much! (they'll be with us on our first
Disney cruise in November) plus the $ per diem is out of sight.