Ruling 500:
It is possible that the blood of nifās lasts no longer than a moment; however, it is not considered to be nifās if the blood continues for more than ten days.
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)
Purity: Duration of Nifas
Practical Laws of Islam as per the teachings of Ayatullah Sistani
