Buenos Aires is 4 hours behind Berlin (winter) or 5 hours behind (summer). When it's 3:00 PM in Berlin, it's 10:00 AM or 11:00 AM in Buenos Aires. Argentina does not observe DST.
Berlin uses CET/CEST while Buenos Aires uses ART (Argentina Time).
Optimal window: 2:00 PM - 6:00 PM Berlin time (9:00 AM - 1:00 PM Buenos Aires). Afternoon calls from Berlin reach morning business hours in Argentina.
Argentina has a significant German heritage community, particularly in Buenos Aires.