Depends, what bike and sort of trip do you have in mind? You can cover a lot of ground in Argentina and Chile, but less so in Bolivia. But then sticking to main routes in Bolivia perhaps you can get away with 80kph, but then some days on the alitplano routes I was averging less than 80k per day! It really depends how much you want to fit in and if you want to do much off-road stuff. Crossing from Volcan Sajama down across to the salt flat Uyuni took me four days, but getting back to La Paz on the highway took one day. Personally I think 6 months is plenty, even enough too get in a good loop in of Peru without going to far north.
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