Rome 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 Rome.
Plan around 8:00 AM to 12:00 PM in Medellín, which is 2:00 PM to 6:00 PM in Rome, to catch everyone during office hours. A 4-hour overlap gives you a workable daily window; aim for earlier in it to avoid clipping the end of someone's day. Note that Rome follows daylight saving while Medellín stays put, so the times above drift by an hour seasonally.