Judgment of the General Court (Sixth Chamber) of 1 December 2021.#Union syndicale Solidaires des services départementaux d'incendie et de secours (SDIS) de France et DOM/TOM v European Commission.#Non-contractual liability – Filing of a complaint with the Commission concerning the application of EU law – Time limit for reply – Right to good administration – Mandatory due diligence – Reasonable period – No sufficiently serious breach of a rule of law conferring rights on individuals.#Case T-152/21.