I remember 6 years ago, discovering "The Great South American Journey" operated by Gap adventures (now G Adventures), a 5 month trip around the continent (although essentially a bunch of their smaller tours joined together).
Then this year, I found this: a 43 week tour of Africa, covering something like 28 countries in that time.
I was wondering - two parts, what's the longest official tour offered in the world in terms of time travelling, and which official tour covers the most number of countries?