Medellín is 2 hours behind Montevideo
Best overlap: 10:00 AM to 6:00 PM in Montevideo is 8:00 AM to 4:00 PM in Medellín.
Both teams are at their desks between 10:00 AM to 6:00 PM in Montevideo and 8:00 AM to 4:00 PM in Medellín. 8 hours of shared hours is more than enough — slot meetings wherever they're most convenient for the people involved.