In France, the general rule is that one cannot remain in police custody for more than 24 hours from the time of the arrest.
ɪn fɹˈæns, ðə dʒˈɛnɚɹəl ɹˈuːl ɪz ðˈætwˌʌn kænˈɑːt ɹᵻmˈeɪn ɪn pəlˈiːs kˈʌstədi fɔːɹ mˈoːɹ ðɐn twˈɛnti fˈoːɹ ˈaʊɚz fɹʌmðə tˈaɪm ʌvðɪ ɚɹˈɛst.