Casablanca is 6 hours ahead of Medellín
Best overlap: 8:00 AM to 12:00 PM in Medellín is 2:00 PM to 6:00 PM in Casablanca.
For the smoothest call, aim inside 8:00 AM to 12:00 PM in Medellín, i.e. 2:00 PM to 6:00 PM in Casablanca. Since Casablanca is 6 hours ahead of Medellín, the workdays overlap by around 4 hours; 8:00 AM in Medellín (2:00 PM in Casablanca) makes a reliable recurring slot.