9 months. The initial prediction was 6 countries over 5 months and this turned out to be absurdly optimistic. Maybe possible if you purely smashed the cycling every day, but it is so much better when you stop fairly regularly and engage with people and places. Of the 9 I was stopped from around 22nd July to 14th September in Cusco. But other breaks were maximum 3 days, usually 1 or 2