Zurich is 9 hours ahead of Portland
Best overlap: 8:00 AM to 9:00 AM in Portland is 5:00 PM to 6:00 PM in Zurich.
Keep meetings inside 8:00 AM to 9:00 AM in Portland — that maps to 5:00 PM to 6:00 PM in Zurich. Since Zurich is 9 hours ahead of Portland, the overlap is narrow (about 1 hour); a single, well-protected slot beats hunting for time each week.