104That being said, the fact that the AECE, in breach of its duty to have regard for the welfare of its staff, did not reply with the necessary speed to the request for assistance pursuant to Article 24 of the Staff Regulations, while it may render the institution concerned liable for any damage caused to the applicant, cannot, in itself, affect the legality of the second decision refusing assistance under Article 24 of the Staff Regulations. Infringement of the ‘reasonable time’ principle can justify annulment of a decision taken at the end of an administrative procedure, such as the second decision refusing assistance, only where the undue delay is likely to have an effect on the actual substance of the decision adopted at the end of the administrative procedure (see, to that effect, order of 13 December 2000, SGA v Commission, C‑39/00 P, EU:C:2000:685, paragraph 44; judgments of 6 December 2012, Füller-Tomlinson v Parliament, T‑390/10 P, EU:T:2012:652, paragraph 116, and of 18 May 2009, Meister v OHIM, F‑138/06 and F‑37/08, EU:F:2009:48, paragraph 76 and the case-law cited), which is not the situation in the present case.