Frankfurt 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 Frankfurt.
For a call that suits both sides, look at 8:00 AM to 9:00 AM in Portland / 5:00 PM to 6:00 PM in Frankfurt. With about 1 hour of common time, this pairing rewards planning — 8:00 AM in Portland / 5:00 PM in Frankfurt is the slot to defend.