Ha, ha, I don't mean BA's World Traveller!

Years ago, friends were joking that someone was a world traveller for having been to Europe twice. What's the FT definition?

Possibilities:
1. Been to 50 countries. A country counts even if just at the airport.
2. Been to 100 countries. Too strict a definition.
3. Been to 25 countries but must be located in at least 5 continents.
4. Body passed through every longitude. For Americans, flying between India and Singapore is probably the hardest stretch as Indian bound passengers often fly through Europe and Thailand or Singapore is reached usually over the Pacific.
5. Minimum of 20 trips and at least criteria 3.
6. Minimum of 2 years abroad and 20 countries.
7. other