Montreal is 1 hour behind São Paulo
Best overlap: 9:00 AM to 6:00 PM in São Paulo is 8:00 AM to 5:00 PM in Montreal.
Aim for 9:00 AM to 6:00 PM São Paulo time — that's 8:00 AM to 5:00 PM over in Montreal. Montreal is 1 hour behind São Paulo, but you still share a generous 9 hours of overlap, so scheduling is easy and there's room to move a meeting when you need to. Remember that Montreal shifts for daylight saving and São Paulo doesn't, so recalculate the overlap after each clock change.