Bucharest is 7 hours ahead of Medellín
Best overlap: 8:00 AM to 11:00 AM in Medellín is 3:00 PM to 6:00 PM in Bucharest.
If you set up a recurring sync, 8:00 AM to 11:00 AM in Medellín (3:00 PM to 6:00 PM in Bucharest) is the natural home for it. Bucharest is 7 hours ahead of Medellín, which gives you a solid 3-hour window. Book earlier in it and neither side is rushing. These times hold for most of the year, but Bucharest's daylight saving (which Medellín doesn't use) shifts them by an hour twice annually.