Barcelona 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 Barcelona.
For the smoothest call, aim inside 8:00 AM to 9:00 AM in Portland, i.e. 5:00 PM to 6:00 PM in Barcelona. Barcelona is 9 hours ahead of Portland. That's only 1 hour of overlap, so pair live calls with async follow-ups to make the most of it.