More on the machloket between R. Matanah and Bar Peda. The practical difference between their views is one who becomes impure on the 30th day, because if it's only 29 days, the impurity shouldn't negate the entirety of the nezirut. [Talmudic concept: miktzat ha-yom ke-kulo] Plus, the Gemara lines up this dispute with another one, by tannaim. Also, the impact of growing one's hair long, which takes a minimum of 30 days. Which also raises the question of whether the word, "until" is inclusive of the day mentioned, or not.