Barcelona is 4 hours ahead of Brasília
Best overlap: 8:00 AM to 2:00 PM in Brasília is 12:00 PM to 6:00 PM in Barcelona.
Both teams are at their desks between 8:00 AM to 2:00 PM in Brasília and 12:00 PM to 6:00 PM in Barcelona. 6 hours of shared hours is more than enough — slot meetings wherever they're most convenient for the people involved. One seasonal catch: Barcelona springs forward and falls back, but Brasília doesn't, so the gap changes by an hour for several months of the year.