It is narrated from Ahmad ibn Ali ibn Mahbub, from Ahmad ibn Ubdus, from Al-Hasan ibn Ali, from Al-Mufaddal ibn Salih, from Laith Al-Muradi, from Abu Abdullah عليه السلام, who said: I asked Imam عليه السلام about the duration of nifas (postnatal bleeding), at what point it becomes obligatory for her to pray, and what she should do. Imam عليه السلام said: "There is no fixed limit for her."