San Diego is 5 hours behind Brasília
Best overlap: 1:00 PM to 6:00 PM in Brasília is 8:00 AM to 1:00 PM in San Diego.
Both offices are open during 1:00 PM to 6:00 PM Brasília time, which is 8:00 AM to 1:00 PM in San Diego. Roughly 5 hours of common time means scheduling is manageable; just avoid the very edges of the window. Just remember San Diego changes its clocks for daylight saving and Brasília doesn't, so confirm the overlap whenever the seasons turn.