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daf bit: Nedarim 76
A man can anul his wife's vow on the day he learns of
the vow, but not later. What is meant by "day"? The mishna teaches: this
means a calendar day, not 24 hours. If she vowed on the night of Shabbat,
he can anul that night or the following day; if she vowed just before
nightfall, he can anul only until nightfall. (76b)
(The biggest surprise to me was that one can anul a vow on Shabbat at all. There is a discussion of this on 76-77.)
(Email post; I couldn't get to the LJ web site this morning.)

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So she should tell him of her objectionable vows right before nightfall preventing him from thinking it over too long?