C’est “trois mois” après le retour, selon le site officiel.
" * A travel document, issued less than 10 years ago, containing at least two blank pages, with a period of validity at least 3 months longer than the date on which you intend to leave the Schengen Area or, in the case of a long stay, at least three months longer than the expiry date of the visa requested. Be sure to transmit (scan) ALL PAGES of your travel document containing visas, entry and exit stamps or any other inscription."
https://france-visas.gouv.fr/en/web/france-visas/visa-wizard#/