Brasília is 5 hours ahead of Portland
Best overlap: 8:00 AM to 1:00 PM in Portland is 1:00 PM to 6:00 PM in Brasília.
Schedule calls for 8:00 AM to 1:00 PM in Portland — your colleagues in Brasília will be online from 1:00 PM to 6:00 PM. Around 5 hours of overlap is enough to work comfortably, as long as meetings don't drift to the end of one team's day. These times hold for most of the year, but Portland's daylight saving (which Brasília doesn't use) shifts them by an hour twice annually.