I will be giving several talks across Europe, US and Asia in a space of 70 days (2 months more or less). My itinerary starts in the Schengen area, then leads me to Asia and back to the Schengen area and then to the US and back to the Schengen Area and so on.
My question is whether I am going to have issues crossing the Schengen borders with all the entries, which is not supposed to happen since I will be exiting the Schengen area for the last time before the maximum permitted stay for my passport (Argentina).