Medellín is 6 hours behind Vienna
Best overlap: 2:00 PM to 6:00 PM in Vienna is 8:00 AM to 12:00 PM in Medellín.
Plan around 2:00 PM to 6:00 PM in Vienna, which is 8:00 AM to 12:00 PM in Medellín, to catch everyone during office hours. Since Medellín is 6 hours behind Vienna, the workdays overlap by around 4 hours; 2:00 PM in Vienna (8:00 AM in Medellín) makes a reliable recurring slot. Daylight saving complicates things slightly: Vienna observes it, Medellín doesn't, so the difference flexes by an hour part of the year.