Article L3142-129 of the French Labour Code
In order to implement an employee’s entitlement to the leave referred to in Article L. 3142-125, a collective agreement determines : 1° The maximum duration of the leave or period of part-time work; 2° The number of times the leave or period may be renewed; 3° The length of service required to be entitled to the leave or period; 4° The deadlines by which the employee must inform the employer…