Brasília is 6 hours behind Doha
Best overlap: 2:00 PM to 6:00 PM in Doha is 8:00 AM to 12:00 PM in Brasília.
If you set up a recurring sync, 2:00 PM to 6:00 PM in Doha (8:00 AM to 12:00 PM in Brasília) is the natural home for it. With 4 hours of overlap, 2:00 PM in Doha (8:00 AM in Brasília) is a comfortable, repeatable slot for both sides.