Wellington is 18 hours ahead of Medellín
Best overlap: 2:00 PM to 6:00 PM in Medellín is 8:00 AM to 12:00 PM in Wellington.
Book within 2:00 PM to 6:00 PM Medellín time (8:00 AM to 12:00 PM in Wellington) and both teams will be at work. A 4-hour overlap gives you a workable daily window; aim for earlier in it to avoid clipping the end of someone's day. Because Wellington is on the next day, weekend boundaries can shift; check that neither side is meeting on their day off. Note that Wellington follows daylight saving while Medellín stays put, so the times above drift by an hour seasonally.