58. No police officer shall detain in custody a person arrested without warrant for a longer period than under all the circumstances of the case is reasonable, and such period shall not, in the absence of a special order of a Magistrate under section 187, exceed twenty-four hours exclusive of the time necessary for the journey from the place of arrest to the Magistrate's Court, whether having jurisdiction or not.
Bharatiya Nagarik Suraksha Sanhita, 2023
Section 58: Person arrested not to be detained more than twenty-four hours
Chapter V — Arrest of Persons
Source: official text of the Bharatiya Nagarik Suraksha Sanhita, 2023 (Ministry of Home Affairs).