More than once, we have been able to put together 22 consecutive days doing Eastern Caribbean, Western Caribbean, and Southern Caribbean from the same port in Florida as a B2B2S. We do the B2B portion on Carnival where were get free laundry, then switch to another Carnival Ship or a ship from another cruise line for the S2S. There are some ships that operate on a 8-day Eastern/6-day Western/8-day Southern pattern that repeats every 3 weeks making it possible to do a B2B2B with different ports. We prefer to not spend more than 2 weeks on the same ship, so we do a B2B2S or a S2B2B.