São Paulo is 5 hours behind Stockholm
Best overlap: 1:00 PM to 6:00 PM in Stockholm is 8:00 AM to 1:00 PM in São Paulo.
If you set up a recurring sync, 1:00 PM to 6:00 PM in Stockholm (8:00 AM to 1:00 PM in São Paulo) is the natural home for it. You share roughly 5 hours a day. That's enough for regular meetings, but treat the window as prime time and guard it. Remember that Stockholm shifts for daylight saving and São Paulo doesn't, so recalculate the overlap after each clock change.