05:33
NOT NOW
The commute into Marunouchi is the real start of the pingable day in Tokyo. Before 09:00 you are writing to a train, a motorbike, or a kitchen. Nine-to-six on paper, later in practice. After 21:00 a Slack ping can feel like a fire alarm; Golden Week is a blackout. Tokyo does not shift for daylight saving; the clock stays UTC+9 all year. If you must write outside 09:00–18:00 local, schedule send it.
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Tokyo is 05:33. Verdict: NOT NOW. Check before you ping →
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