In the absence of the agreement mentioned inarticle L. 3142-129, the request to extend the leave or the period of part-time work devoted to teaching or research previously granted is sent to the employer, under the conditions mentioned inarticle D. 3142-77, three months before its end when the duration of the leave or the period of part-time work is six months or more and at least two months before this end when this duration is less than six months.