Brasília is 4 hours behind Munich
Best overlap: 12:00 PM to 6:00 PM in Munich is 8:00 AM to 2:00 PM in Brasília.
For the smoothest call, aim inside 12:00 PM to 6:00 PM in Munich, i.e. 8:00 AM to 2:00 PM in Brasília. That's a roomy 6 hours of common time each day, so finding a slot that suits everyone is rarely a problem. Don't be caught out by clock changes — Munich observes daylight saving and Brasília doesn't, so the offset varies by an hour through the year.