Rashi on Leviticus
ימים רבים [AND IF A WOMAN HAVE AN ISSUE OF HER BLOOD] MANY DAYS — at least three days (since the plural ימים suggests at least two days, the word רבים, “more", must imply at least three days) (cf. Sifra, Metzora Parashat Zavim, Section 5 9),
Rashbam on Leviticus
בלא עת נדתה, after the days of her menstruation have passed, as explained in Niddah 73 A woman is not described as being a zavah so that she would have to bring an offering after being healed unless the seven days during which she was a menstruant or expected to be a menstruant have passed. If after that period during the next 11 days she sees the symptoms of a zavah for three consecutive days she will require to count seven consecutive days during which she is free of these symptoms in order to be able to become ritually pure again. On the eighth day she is ready to offer her two bird offerings, one as a sin offering the other as a burnt offering.