18:06
MAYBE
Checking your clock…
Industry sets the pulse in Batel as much as the IANA zone America/Sao_Paulo. Planner-city hours: more 08:30 than 09:30, and evenings that end before São Paulo's. The polite window around Batel is 08:00–18:00 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. Curitiba does not shift for daylight saving; the clock stays UTC−3 all year.
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Curitiba is 18:06. Verdict: MAYBE. Check before you ping → https://asleep.today/curitiba