Medellín is 6 hours behind Oslo
Best overlap: 2:00 PM to 6:00 PM in Oslo is 8:00 AM to 12:00 PM in Medellín.
Plan around 2:00 PM to 6:00 PM in Oslo, which is 8:00 AM to 12:00 PM in Medellín, 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 Oslo follows daylight saving while Medellín stays put, so the times above drift by an hour seasonally.