Buenos Aires and Rio de Janeiro are in the same time zone. Both cities use UTC-3 (Argentina Time and Brasilia Time respectively). Neither currently observes daylight saving time.
When it's 12:00 PM in Buenos Aires, it's also 12:00 PM in Rio de Janeiro. The time is always identical.
Any time works! Since both cities are in the same time zone, scheduling calls is never a problem. Business hours are identical.
Buenos Aires and Rio de Janeiro are South America's two largest metropolitan areas and have strong cultural and economic ties. Direct flights take about 3 hours.