For the source text click/tap here: Nedarim 76
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Our Mishnah states that the revoking of nedarim can be performed the entire day. This can be a leniency and a stringency. How is this? If she made a neder on Friday night, he may revoke it Friday night and Shabbos day until it gets dark (nightfall). If, however, she made a neder right before it got dark, he may revoke it as long as it is not yet dark. If it got dark and he did not yet revoke it, he may not revoke it any longer.
Our Daf cites a braisa: The revoking of her nedarim can be performed the entire day. Rabbi Yosi the son of Rabbi Yehudah and Rabbi Elozar the son of Rabbi Shimon say: They (her husband and father) have twenty-four hours (from the moment her neder was heard) to revoke it.
We explore the notion of time linear vs cyclical as well as the metaphor of : מִיּוֹם אֶל יוֹם
Or "one day at a time" psychologically and spiritually
(in recovery).