17:27
MAYBE
Checking your clock…
Night-desk rule for Portland: if you would not ring a bell in Old Port at that hour, do not Slack. Not Oregon. Eastern Time, earlier nights, and a real distinction from the other Portland. Portland still shifts with daylight saving (UTC−5 in January, UTC−4 in July). The polite window around Old Port is 08:00–17:00 local. Put the timezone in the invite title so nobody has to do the math in public.
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Portland is 17:27. Verdict: MAYBE. Check before you ping → https://asleep.today/portland-me