Honolulu is 7 hours behind São Paulo
Best overlap: 3:00 PM to 6:00 PM in São Paulo is 8:00 AM to 11:00 AM in Honolulu.
For a call that suits both sides, look at 3:00 PM to 6:00 PM in São Paulo / 8:00 AM to 11:00 AM in Honolulu. You share roughly 3 hours a day. That's enough for regular meetings, but treat the window as prime time and guard it.