Beijing is 16 hours ahead of Portland
Best overlap: 4:00 PM to 6:00 PM in Portland is 8:00 AM to 10:00 AM in Beijing.
The sweet spot is 4:00 PM to 6:00 PM Portland time, matching 8:00 AM to 10:00 AM in Beijing. Just 2 hours of shared hours means there's little margin — set 4:00 PM in Portland (8:00 AM in Beijing) and start promptly. The two cities aren't on the same date during this window — Beijing runs the next day from Portland. Watch the DST gap — when Portland changes its clocks and Beijing stays the same, this window slides by an hour.