Scientists differed on this issue. Some say there is no limit for its minimum, and I say so. Some say its limit is twenty-five days, some say its limit is eleven days, some say twenty days. As for its maximum time, some say sixty days, some say seventeen days, and some say forty. And whoever says that for the male there are thirty days and for the female forty days, and it is better for him to refer in this to the conditions of women, for as long as there is a proven Sunnah for it, he can refer to it.