I was born in Mexico, but am a U.S. Citizen with a U.S. Passport. I want to visit several South American countries over a five-month period. A round-trip ticket is the cheapest, so I propose to fly into Bogota, Colombia... stay a couple of weeks, and then bus it to Venezuela, Brazil, Ecuador, return to Colombia and then take my return flight back to the U.S. I know I can travel to Colombia for 60 days no problem... Possibly get an extention for another 60 days, but that would not cover the five months I plan to travel in South America. My question is: when I leave Colombia after two weeks, does the clock keep running on my 60 days, or is that only for the time I am in the country. When I return five months later to take the flight back to U.S. will they let me back in? Also, when I arrive and when they see that my return flight is five months later, would that be a problem. It is really hard to get questions like this answered through their counselate. They don't understand what I am trying to ask.