Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
darimi:953And Saʾalt al-Zuhry

[Machine] About a man who divorced his wife, then she had two menstruations, and then her menstruation ceased. How long should she wait before remarrying? He said, "Her waiting period is one year."  

الدارمي:٩٥٣قَالَ وَسَأَلْتُ الزُّهْريَّ

عَنْ رَجُلٍ طلَّقَ امْرَأَتَهُ فَحَاضَتْ حَيْضَتَيْنِ ثُمَّ ارْتَفَعَتْ حَيْضَتُهَا كَمْ تَرَبَّصُ؟ قَالَ «عِدَّتُهَا سَنَةٌ»