Having discussed 'Charishah' in Pasuk 12, why does the Torah repeat it here?
Nedarim, 79a: Charishah in Pasuk 12 1 is referring to where the husband is silent in order to endorse the Neder and here it is referring where he remains silent in order to upset his wife 2 , whereas "ki Hecherish lah" at the end of the Pasuk is referring to where he is silent S'tam, without any specific intention - Torah Temimah). 3
What are the connotations of "mi'Yom el Yom"?
Rashi and Targum Yonasan: It means that a father and a husband can annul the Nedarim of his daughter or his wife until nightfall. 1
Nedarim, 76b (according to R. Yossi b?R. Yehudah and R. Elazar b?R. Shimon): It teaches us that a husband and a father are permitted to be Meifer Nedarim at nighttime (since ?mi?Yom el Yom? implies twenty-four hours - Torah Temimah). 2
Mizrachi: Because when night falls, the next day begins. Rashi: To preclude the opinion that he has twenty-four hours in which to annul. See Torah Temimah in Pasuk 9, note 63, and refer to 30:9:2:2
See Nedarim, ibid. as to why, according to this opinion, the Torah wrote ?be?Yom Shamo?a Iyshah? in Pasuk 9.
QUESTIONS ON RASHI
Rashi writes that "mi'Yom el Yom" teaches that Hafarah is only until nightfall after he hears the vow, and not for twenty-four hours. But the Chachamim learn this from "be'Yom Sham'o", and those who disagree learn from "mi'Yom el Yom" that he has twenty-four hours?
See Torah Temimah in Pasuk, note 63, who, after amending Rashi to read 'le'Kach Ne'emar be'Yom Shemo'a' equates Rashi with the Sifri.