Ruling 476 — Purification (Ṭahārah)

If a woman with a habit of time and duration experiences bleeding for more than ten days, the bleeding that she experiences on the days of her habit – even if it does not have the attributes of ḥayḍ – is ḥayḍ; and the bleeding that she experiences after the days of her habit – even if it has the attributes of ḥayḍ – is istiḥāḍah. For example, if a woman whose habit is from the first of the month to the seventh experiences bleeding from the first of the month to the twelfth, the first seven days are ḥayḍ and the next five days are istiḥāḍah.