18:27
MAYBE
Checking your clock…
Industry sets the pulse in Microcentro / Palermo offices as much as the IANA zone America/Argentina/Buenos_Aires. Cena is at 22:00; work still starts near 09:30. A 20:00 ping can be fine; a 08:00 ping is not. The polite window around Microcentro / Palermo offices is 09:00–18:00 local. Daylight is honest here; if it looks like evening, it probably is. If you only remember one rule: Do not stack follow-ups just because you are still in your afternoon.
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Buenos Aires is 18:27. Verdict: MAYBE. Check before you ping → https://asleep.today/buenos-aires