Medellín is 7 hours behind Bucharest
Best overlap: 3:00 PM to 6:00 PM in Bucharest is 8:00 AM to 11:00 AM in Medellín.
Schedule calls for 3:00 PM to 6:00 PM in Bucharest — your colleagues in Medellín will be online from 8:00 AM to 11:00 AM. You share roughly 3 hours a day. That's enough for regular meetings, but treat the window as prime time and guard it. Remember that Bucharest shifts for daylight saving and Medellín doesn't, so recalculate the overlap after each clock change.