101As regards the overall delay in handling the request for assistance in the present case, it must be recalled that, as the Staff Regulations make no specific provision as to the period within which an administrative inquiry must be conducted by the administration, inter alia in cases alleging psychological harassment, the AECE must have due regard in those circumstances for the ‘reasonable time’ principle (see, to that effect, judgment of 24 April 2017, HF v Parliament, T‑570/16, EU:T:2017:283, paragraphs 59 and 62). In that regard, the EU institution or body concerned must, when conducting an administrative inquiry, ensure that each measure is adopted within a reasonable time following the previous measure (see judgment of 10 June 2016, HI v Commission, F‑133/15, EU:F:2016:127, paragraph 112 and the case-law cited) and, contrary to the Parliament’s claim, the fact that the applicant and Ms M. had left the institution is not such as to release the AECE from its obligation to act swiftly in handling the request for assistance, inter alia in the light of the objectives assigned to it under Article 24 of the Staff Regulations, as referred to in paragraphs 97 and 98 above.