Purity: Nifas for a Woman with a Habit of Duration

Practical Laws of Islam as per the teachings of Ayatullah Sistani

Ruling 505:

If a woman with a habit of duration of ḥayḍ experiences bleeding more than once and the total number of her bleeding exceeds the number of days of her habit and is more than ten days, she must consider the number of days of her habit to be nifās, and based on obligatory precaution, in the days after the number of days of her habit until the tenth day, she must refrain from doing the things that are unlawful for a nufasāʾ and perform the things that are obligatory for a mustaḥāḍah.

-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)