Ata said: The maximum duration of menstruation is fifteen days.
Hadith Referenceسنن دارمي / من كتاب الطهارة / 866
Hadith Gradingتحقیق (حسین سلیم أسد الدارانی):إسناده ضعيف فيه عنعنة ابن جريج، [مكتبه الشامله نمبر: 870]
Hadith Takhrijاس قول کی سند ضعیف ہے۔ دیکھئے: [فتح الباري425/1] ، [دارقطني 208/1] ، [بيهقي 321/1] و [المعرفة 2274]
Brief Explanation
(Commentary on Ahadith 855 to 866)
There is a difference of opinion regarding the duration of menstruation (hayd). Generally, it lasts for seven days. The statements in this chapter are the ijtihad (independent reasoning) of the esteemed scholars, and there is no authentic hadith narrated on this matter. Furthermore, every woman knows well the duration of her own menstrual cycle.