If we ever get enough time on our hands, I planned out our 125-day trip across the globe :
Los Angeles to Sydney--6 days
Sydney to Thailand--4 days
Thailand to Vietnam--4 days
Vietnam to Japan--7 day
Japan to S. Korea--2 days
S. Korea to China--14 days
China to India--6 days
India to Russia--3 days
Russia to Egypt--2 days
Egypt to Kenya--3 days
Kenya to Morocco--3 days
Morocco to Portugal--3 days
Portugal to Spain--4 days
Spain to France--4 days
France to Switzerland--2 days
Switzerland to Italy--6 days
Italy to Greece--4 days
Greece to Turkey--2 days
Turkey to Hungary--2 days
Hungary to Czech Republic--2 days
Czech Republic to Austria--2 days
Austria to Germany--5 days
Germany to Finland--2 days
Finland to Sweden--2 days
Sweden to Norway--2 days
Norway to London--3 days
London to Ireland--4 days
Ireland to Brazil--5 days
Brazil to Argentina--4 days
Argentina to Chile--3 days
Chile to Peru--6 days
Peru to Ecuador/Galapagos--6 days
Ecuador/Galapagos to Belize--3 days
Belize to Yucatan Peninsula--3 days
Yucatan Peninsula to Mexico City--2 days
Mexico City to Los Angeles...
-----
Perhaps one day...
Notable exceptions are New Zealand, Indonesia, Cambodia, Malaysia, Singapore, South Africa, Scotland, south South America (like the Strait of Magellan), and Canada. But c'mon, adding those countries would be unrealistic.