Vienna is 5 hours ahead of São Paulo

Best overlap: 8:00 AM to 1:00 PM in São Paulo is 1:00 PM to 6:00 PM in Vienna.

The overlap falls at 8:00 AM to 1:00 PM in São Paulo, or 1:00 PM to 6:00 PM if you're in Vienna. Roughly 5 hours of common time means scheduling is manageable; just avoid the very edges of the window. Because only Vienna changes its clocks, the overlap above isn't fixed; expect a one-hour shift when Vienna enters or leaves daylight saving.