Portland is 9 hours behind Zurich
Best overlap: 5:00 PM to 6:00 PM in Zurich is 8:00 AM to 9:00 AM in Portland.
Shoot for 5:00 PM to 6:00 PM in Zurich; your Portland colleagues will see that as 8:00 AM to 9:00 AM. Portland is 9 hours behind Zurich. That's only 1 hour of overlap, so pair live calls with async follow-ups to make the most of it.