80In the light of all the foregoing considerations, the answer to the second question is that Articles 20 and 31 of the Charter are to be interpreted as not precluding the normal length of night work fixed at seven hours in the national law of a Member State for workers in the private sector from not applying to public-sector workers, including police officers and firefighters, if that difference in treatment is based on an objective and reasonable criterion, that is, if the difference relates to a legally permitted aim pursued by that legislation, and it is proportionate to that aim.
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