Miami is 6 hours behind Geneva
Best overlap: 2:00 PM to 6:00 PM in Geneva is 8:00 AM to 12:00 PM in Miami.
Shoot for 2:00 PM to 6:00 PM in Geneva; your Miami colleagues will see that as 8:00 AM to 12:00 PM. Since Miami is 6 hours behind Geneva, the workdays overlap by around 4 hours; 2:00 PM in Geneva (8:00 AM in Miami) makes a reliable recurring slot.