46As regards the inclusion of the duration in the coefficient of seriousness, the Kingdom of Belgium challenges the factors adopted by the Commission to determine it. According to the case-law of the Court, and, in particular, Case C-407/09 Commission v Greece [2011] ECR I-2467 and the Communication from the Commission SEC(2005) 1658, as updated, the criteria of seriousness and duration of the infringement must be determined in a strictly separate manner.
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