17:27
MAYBE
Checking your clock…
People in Havana keep office hours that look familiar on a slide and stranger in practice. The polite window around Vedado is 08:00–17:00 local. Eastern-ish with DST. Connectivity is the constraint as much as manners; send once, wait. Daylight is honest here; if it looks like evening, it probably is. Ping their late morning unless you already share an on-call rota. Havana still shifts with daylight saving (UTC−5 in January, UTC−4 in July).
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Havana is 17:27. Verdict: MAYBE. Check before you ping → https://asleep.today/havana