Brasília is 2 hours ahead of Washington, D.C.
Best overlap: 8:00 AM to 4:00 PM in Washington, D.C. is 10:00 AM to 6:00 PM in Brasília.
If you set up a recurring sync, 8:00 AM to 4:00 PM in Washington, D.C. (10:00 AM to 6:00 PM in Brasília) is the natural home for it. Despite the 2-hour difference, an 8-hour overlap keeps things simple and gives both teams breathing room. Remember that Washington, D.C. shifts for daylight saving and Brasília doesn't, so recalculate the overlap after each clock change.