Medellín is 6 hours behind Madrid
Best overlap: 2:00 PM to 6:00 PM in Madrid is 8:00 AM to 12:00 PM in Medellín.
Aim for 2:00 PM to 6:00 PM Madrid time — that's 8:00 AM to 12:00 PM over in Medellín. Around 4 hours of overlap is enough to work comfortably, as long as meetings don't drift to the end of one team's day. Remember that Madrid shifts for daylight saving and Medellín doesn't, so recalculate the overlap after each clock change.