Ruling 472

If a woman with a habit of time and duration experiences bleeding on some of the days of her habit and a few days before her habit, and if the total number of days does not exceed ten, then the bleeding on all those days is considered to be ḥayḍ. If the bleeding exceeds ten days, the bleeding on the days of her habit plus the few days before that – which total the number of days of her habit – is ḥayḍ, and the bleeding on the first few days is considered to be istiḥāḍah. If she experiences bleeding on some days of her habit and a few days after her habit, and the total number of days do not exceed ten, then the bleeding on all the days is ḥayḍ. If it exceeds ten days, the bleeding on the days of her habit plus a few days after that – which total the number of days of her habit – is ḥayḍ, and the bleeding on the remaining days is considered to be istiḥāḍah.