Article R6223-10 of the French Labour Code
I.-In order to enable apprentices to complete their training, in application of article L. 6221-1, part of their practical training may be provided in companies other than the one employing them, in particular in order to use equipment or techniques which are not used in the company employing them. The apprentice’s stay in companies other than the one employing him may not exceed half of the in-company training time stipulated…