Portland is 16 hours behind Beijing
Best overlap: 8:00 AM to 10:00 AM in Beijing is 4:00 PM to 6:00 PM in Portland.
Your window to reach both cities is 8:00 AM to 10:00 AM in Beijing, which converts to 4:00 PM to 6:00 PM in Portland. The shared window is only 2 hours — treat 8:00 AM in Beijing (4:00 PM in Portland) as the one fixed point and plan everything else around it. Keep the date straight: Portland is on the previous day versus Beijing, which can trip up Friday or Monday meetings. A quick caveat — Portland's clocks move for daylight saving and Beijing's don't, so the times here are right for only part of the year.