How long does a round the world cruise take?

81 days

http://www.cunard.com/Destinations/default.asp?Region=14

“A World Cruise? I would choose Cunard, of course. They have the experience.

The desire to discover what lies beyond the horizon has been a part of the human psyche since time immemorial. But it wasn’t until 1519 when Ferdinand Magellan found a passage to the Pacific that a global circumnavigation became more than a glint in the adventurer’s eye. And not until 1922 when Cunard’s Laconia made the first passenger circumnavigation that adventurous travellers could follow in Magellan’s wake.

Queen Elizabeth 2 has been circling the globe for 25 years. Nobody knows her way around like she does. In 2006, she’ll be visiting 42 ports on six continents. And she’ll be visiting more of the world than ever during her 2007 Silver Jubilee – 41 great cities and 25 nations on five continents. At virtually every stop along the way, she’ll be welcomed with the fanfare of a celebrity. After all, her reputation preceeds her. She’s the international symbol of luxury travel.

2007 marks a momentous event in Cunard’s illustrious history: Queen Mary 2′s Maiden World Cruise.

We invite you to join us on this exciting maiden voyage as Queen Mary 2 carves a lightening swath around the globe in a mere 81 days. Proud, stylish, with unmatched grace and peerless power, Queen Mary 2 is the greatest ocean liner of our time.

Come discover the thrill of sailing a legend. Enjoy the singular excitement of circumnavigating the globe in the high style and easy grace that royals, stars of film and stage and other glamorous travellers have shared before you. A Cunard World Cruise will be the voyage of a lifetime, the dream of a lifetime. We invite you to celebrate”