374Secondly, it must be held, as observed by the ECB, that the EU legislature carried out an assessment as to the reasonableness of the period laid down by those provisions by weighing the relevant opposing interests, on the one hand, the private interests of the credit institutions in having as much time as possible to make their observations and, on the other, the public interest in having legality restored as quickly as possible. The applicants cannot therefore call into question the reasonableness of the periods laid down in the SSM Framework Regulation, unless they raise a formal plea of illegality against the provisions concerned.