42With regard more specifically to the concept of ‘working time’ within the meaning of Directive 93/104, it has already been held that the directive defines that concept as any period during which the worker is working, at the employer's disposal and carrying out his activity or duties, in accordance with national laws and/or practices, and that that concept is placed in opposition to rest periods, the two being mutually exclusive (Simap, paragraph 47, and Jaeger, paragraph 48).
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