HARHAR, RM--I also have done several--about a dozen on the dearly departed SS Norway (yes, she blew up while we were sleeping! Luckily in port) As well as about 6 trips on the Norwegian Dream and one on RCCL. We're looking into rivr cruises and Asia interests me more than EU, but once Boss is retired, the ocean's the limit. There are some incredible deals off-season for the luxury lines but they frequently run for 12-14 days--way TOO long for us. What as the longest you "endured"? Have you done T/O?