https://www.epo.org/en/service-support/faq/searching-patents/asian-patent-information/japan/filing-grant/what-time-limit
What is the time limit for responding to official actions in Japan?
In Japan there is a time limit of three months for responding to official actions (except for those relating to formal requirements only). It is also possible to apply for a three-month extension of the time limit. The same time limit applies to replies in opposition cases or responses in court cases.
For official actions relating to formal requirements, the time limit for filing a reply is 30 days (no extension possible).
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