46In that regard, it is clear from the case-law that the setting of time limits must, in principle, satisfy the requirement of effectiveness since it constitutes an application of the fundamental principle of legal certainty which protects both the person and the administration concerned. Such time limits are not, in principle, liable to make it in practice impossible or excessively difficult to exercise the rights conferred by EU law (see, inter alia, judgment of 21 December 2016, TDC, C‑327/15, EU:C:2016:974, paragraph 98).
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