You know the contract duration for some of the non performing jobs say, for example, "Vendeur(euse)s Boutiques (F/H), CDD de 2 à 8 mois " Can you choose how long you want to work for, like if I only wanted to work 2 months could I dictate how long I wanted to stay or do they tell you?
When applying you can tell your availability.
Whether they choose you or someone who's available for a longer time depends on which contracts they have to offer.