How does a woman who believes there is no minimum or maximum limit for menstruation act if her period does not complete a month, and does not come two or three days before the month? When does she consider herself to have Istihadah (non-menstrual vaginal bleeding)?

We do not issue fatwas based on this statement because it is not precise, and we have not found a correct criterion to distinguish menstruation from irregular bleeding (istihadah (definition)), even with Shaykh al-Islam Ibn Taymiyyah or Shaykh Ibn Uthaymeen. Although the latter adopted this view, he did not define it with a clear criterion. Ibn Uthaymeen mentioned that menstruation, whenever it comes, is menstruation, and a woman should refrain from prayer and fasting if she sees blood after a period of purity, unless the blood continues or only stops for a short time, in which case she is considered to have irregular bleeding and should only refrain for the duration of her customary period. In another place, he said that menstruation is what women recognize as the usual menstrual blood, and she must refrain even if it exceeds her customary period, unless it exceeds most of the month, in which case it is irregular bleeding. This aligns with the view of the majority scholars who define it by fifteen days.