Medellín is 6 hours behind Warsaw
Best overlap: 2:00 PM to 6:00 PM in Warsaw is 8:00 AM to 12:00 PM in Medellín.
Shoot for 2:00 PM to 6:00 PM in Warsaw; your Medellín colleagues will see that as 8:00 AM to 12:00 PM. A 4-hour overlap gives you a workable daily window; aim for earlier in it to avoid clipping the end of someone's day. Seasonal note: Warsaw uses daylight saving and Medellín doesn't, so double-check the times in your own months — they can move by an hour.