41In that regard, it must be borne in mind that the classification for legal purposes of an act by the General Court is a question of law which may be raised in an appeal (judgment of 23 November 2017, Bionorica and Diapharm v Commission, C‑596/15 P and C‑597/15 P, EU:C:2017:886, paragraph 55 and the case-law cited). That is true of the question whether a letter, such as the appellant’s letter to the Commission of 28 September 2018, is of a ‘binding nature’ and must therefore be regarded as a request to act causing the time limit referred to in Article 265 TFEU to run (see, by analogy, judgment of 1 June 2006, P & O European Ferries (Vizcaya) and Diputación Foral de Vizcaya v Commission, C‑442/03 P and C‑471/03 P, EU:C:2006:356, paragraph 90 and the case-law cited).
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