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Based on the statistical, social, and legal dimensions of norms, this article studies the alternate alignment and disconnection between legal rules and practices of working time. Analyzing the implementation of the 35-hour week in France, the author shows that the endogenization of law in practice is an ambivalent process, combining organizations’ legalization and law’s managerialization. By helping to bring the law into the service of management and organizational values, this process transforms the meaning of the rules in the firms, and also in the courts, when they have to judge the cases submitted to them. In terms of work time, companies become not only legislators enacting different rules for public standards, but also judges (partially) creating their own internal settings of dispute resolution that remain largely dominated by their own management requirements.