Travelers have been drawn to the idea of leisure cruise vacations since the 1800s, when ships departed for destinations such as Greece and Italy. As cruise ships have grown in luxury amenities, size and technology, sailing times have increased. In 1922, Cunard inaugurated the first round-the-world cruise, which called at 22 ports and set the standard for long-term cruising. So if a week-long trip doesn’t cut it, check out the world’s longest cruises. Some depart in 2020, so you’ve got plenty of time to plan and save.

120-Night Grand Round the World Cruise by Cruise & Maritime Voyages

Set sail from London on a four-month voyage of five continents and no less than 27 countries. Onboard the spacious Columbus liner you’ll visit some of the world’s most exciting cities, including Mumbai, Shanghai, Sydney and Tokyo. Kick back on the beaches of pristine Pacific islands and join tours to sacred landmarks in Egypt and Jordan. The journey even takes you along both the Panama Canal and Suez Canal.

The next voyage departs on Jan 6, 2020, and prices start at £8,499 ($11,299) per person.

Find out more here: Grand Round the World Cruise

139-Night Legends of Cruising by Silversea

Fancy setting foot on all seven continents? If so then this 140-day adventure to 32 countries and 62 ports is for you. You’ll begin in Fort Lauderdale, make stops in the Caribbean and then travel along South America’s east coast. Enjoy the highlights of Brazil, Uruguay and Argentina before a once-in-a-lifetime tour to Antarctica. If that isn’t enough, the journey continues to Easter Island, islands in French Polynesia, Australia, South East Asia, India and Europe.

This cruise departs on Jan 6, 2020, and prices start at $62,000 per person.

Find out more here: Legends of Cruising

145-Night World Cruise by Seabourn

Add an extra week onto your cruise with Seabourn Cruises, who are offering a vacation at sea to 36 countries on five continents. Visit dozens of world-famous cities such as Cape Town, Dakar, Mombasa, Singapore and Sydney. Relish in stops at lesser-known destinations, including Cape Verde’s Mindelo, Namibia’s Luderitz and the Island of Mozambique. During port calls there’s the chance to go on an African safari and snorkel in the perfect-blue waters of the Great Barrier Reef.

The cruise starts in Miami on January 4, 2020, and ends in San Francisco. All-inclusive prices start from $65,999 per person.

Find out more here: Seabourn World Cruise

168-Night World Cruise by Fred. Olsen

Jaw-dropping islands, beguiling white-sand beaches, iconic landmarks and culturally-rich cities are just a few of the things you can look forward to onboard Fred. Olsen’s Boudicca. From Dover, England, you’ll head south to the Canary Islands before sailing around Africa, with stops at Cape Town, Madagascar and the Seychelles. The fun continues in Asia and Australia before returning via the Middle East and the Mediterranean. In between there are trips to the Acropolis in Athens and the Taj Mahal to ponder.

The cruise sets sail on October 3, 2019, and prices start from £17,399 ($23,119) per person.

Find out more here: Fred. Olsen World Cruise

200-Night Global Quest by Oceania Cruises

Why travel from Miami to New York by plane when you can do it over the course of almost seven months by boat? Should time be on your side then you could be ticking off over 100 destination and 40 countries from your travel bucket list. Overnight stops in Bangkok, Havana, Rio de Janeiro and Shanghai allow you to experience many of the world’s most-loved cities. From Alaska to Africa and Central America, this is about as diverse a cruise as you’ll find.

The cruise departs on January 8, 2020, and prices start from $46,499 per person, which includes 78 complimentary shore-based tours.

Find out more here: Global Quest

244-Night Ultimate World Cruise by Viking Ocean Cruises

Any cruise-lover with eight months to spare will be tempted by this luxury circumnavigation of the globe. This mammoth round-trip voyage starts in London and incorporates 53 countries, six continents and over 100 guided tours. Get ready to discover the delights of the United Kingdom, Scandinavia, the Americas, Caribbean, Australasia, Asia, the Middle East and Mediterranean. If you don’t have 245 days free then you can opt for either the 126-night London to Los Angeles or 118-night Los Angeles to London segments.

This cruise departs on August 31, 2019, and prices start from $89,990.

Find out more here: Ultimate World Cruise