Medellín is 8.5 hours behind Tehran
Best overlap: 5:00 PM to 6:00 PM in Tehran is 8:30 AM to 9:30 AM in Medellín.
Both offices are open during 5:00 PM to 6:00 PM Tehran time, which is 8:30 AM to 9:30 AM in Medellín. Because Medellín is 8.5 hours behind Tehran, the shared window is only about 1 hour. A fixed slot at 5:00 PM in Tehran (8:30 AM in Medellín) saves a lot of back-and-forth.