37It follows from the elements set out in paragraphs 33 to 36 of this judgment and also from the need, recalled in paragraph 27 of this judgment, to interpret Article 2(1) of Directive 2003/88 in the light of Article 31(2) of the Charter of Fundamental Rights of the European Union, that the concept of ‘working time’ within the meaning of Directive 2003/88 covers the entirety of periods of stand-by time, including those according to a stand-by system, during which the constraints imposed on the worker are such as to affect, objectively and very significantly, the possibility for the latter freely to manage the time during which his or her professional services are not required and to pursue his or her own interests.
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