If you've booked a cruise before, you know the routine. Fly out, join the ship, rush through a handful of ports, fly home, and spend the next week catching up on sleep. It works fine for a short trip. But a growing number of UK travellers are skipping that routine altogether and booking something longer instead — two weeks, three weeks, sometimes months at a time with Fred. Olsen Cruise Voyages » . Here's why that trend is picking up speed.