Article 764-28 of the French Code of Criminal Procedure
The sentenced person is immediately notified of the sentence enforcement judge’s decision. The latter is informed by a statement in the notification that, if he does not accept this decision, he has a period of twenty-four hours in which to submit a request to the sentence enforcement chamber specifying, on pain of inadmissibility, the legal or factual grounds for his challenge and that he has the possibility of being represented…