Portland is 16 hours behind Shanghai
Best overlap: 8:00 AM to 10:00 AM in Shanghai is 4:00 PM to 6:00 PM in Portland.
Aim for 8:00 AM to 10:00 AM Shanghai time — that's 4:00 PM to 6:00 PM over in Portland. Since Portland is 16 hours behind Shanghai, the overlap is narrow (about 2 hours); a single, well-protected slot beats hunting for time each week. Be careful with invites: Portland is on the previous day, so a Monday meeting for Shanghai may land on a different day there. Finally, Portland observes daylight saving and Shanghai doesn't, so this window shifts by an hour for part of the year — recheck it each spring and autumn.