Portland is 2 hours ahead of Honolulu
Best overlap: 8:00 AM to 4:00 PM in Honolulu is 10:00 AM to 6:00 PM in Portland.
The overlap falls at 8:00 AM to 4:00 PM in Honolulu, or 10:00 AM to 6:00 PM if you're in Portland. The 2-hour gap barely gets in the way — you've got 8 hours of overlap, so pick whatever time fits the agenda. Watch the DST gap — when Portland changes its clocks and Honolulu stays the same, this window slides by an hour.