Malbim Ayelet HaShachar Klal 311
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"מלאת הימים" מורה שהזמן המוגבל לאיזה דבר נשלם עד קיצו. (תזריע ס' כא)
Ayelet Hashachar, translated by Betzalel Avraham Feinstein, 2021
מלאת הימים (And when the days of her purification are fulfilled)⁶⁰⁹ teaches that the time that is restricted to a certain matter will be completed in the end.
footnotes: ⁶⁰⁹ Leviticus 12:6.
וכל מקום שבא שם 'ימים' על שנה יכוין על שנת המחזור מיום ליום. (בהר ס' נד)
Ayelet Hashachar, translated by Betzalel Avraham Feinstein, 2021
And any place where the noun ימים (days) comes with respect to a year, it means a year that begins at one time and ends at the same time of the following year.