Oslo 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 Oslo.
Schedule calls for 8:00 AM to 12:00 PM in Medellín — your colleagues in Oslo will be online from 2:00 PM to 6:00 PM. You share roughly 4 hours a day. That's enough for regular meetings, but treat the window as prime time and guard it. Finally, Oslo observes daylight saving and Medellín doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.