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Japan Time · JST · UTC+9

Claude Code Peak Hours in Japan Time (JST)

When Claude Code is busiest in Japan Time (Tokyo, Osaka, Yokohama), and when to work so your limits go further. The heatmap below is already converted to JST (UTC+9) and updates live.

Claude Code heatmap in Japan Time

Messages you send to Claude — the closest measure of load.

Claude Code activity by weekday and hour (Japan Time · JST · UTC+9)
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Japan Time · JST · UTC+9 · All time

Peak and quiet hours in Japan Time

  • Weekday peak5 AM–8 AM
  • Quietest hours11 AM–2 PM
  • Busiest dayThursday
  • Quietest daySaturday
  • Weekend share8%

Based on community data (1,324 messages), 3-hour windows, in Japan Time.

Incidents per Anthropic’s status page

  • Most incidents10 PM–1 AM
  • Fewest incidents11 AM–2 PM
  • Most incident-prone dayFriday

171 incident hours with an open incident for Claude, the API or Claude Code, in Japan Time. Source: status.claude.com, synced hourly.

Anthropic’s stated peak window

9 PM–3 AM (past midnight)

Weekdays, 5–11 AM Pacific, shown in Japan Time. In March 2026 Anthropic said 5-hour limits drain faster during these hours; on May 6, 2026 that reduction was removed for Claude Code on Pro and Max, but it remains the busiest part of the day.

Planning your day

The global weekday peak is 9 PM–3 AM in Japan Time. In Japan Time that window falls outside your usual working hours. It is when North American mornings overlap with the European afternoon, so slow responses and overloaded errors are most likely then.

  • Long agent runs (refactors, migrations, test generation): start them before 9 PM or after 3 AM.
  • During the peak, favour short loops — reviews, small edits, questions about code — where a little latency hurts less.
  • Weekends are noticeably calmer than weekdays in every time zone.
  • If Claude is slow anyway, check the current load and the official status page.

Times account for the current daylight-saving state and are recalculated every time the site rebuilds.

Other time zones