I had pretty much the same thoughts as jfman--including "if you don't get lazy"--but hadn't yet gathered the energy to write it up. And there are an infinite number of side trips and alternatives if you're moving at a steady clip.
You don't mention a time of year, which might make a difference. Nor do you mention whether buying or renting, whether selling at the end of your trip (which will eat into your riding time), or what your interests are. If you like waterfalls, maybe squeeze in Iguazu; if bird and wildlife viewing, the Pantanal; archeological sites are thick in Peru but less common elsewhere; etc.
Hope that's helpful.
Mark
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