It was narrated from 'Aishah that a woman who suffered from Istihadah during the time of the Messenger of Allah ﷺ was told that it was a stubborn vein (i.e., one that would not stop bleeding). She was told to delay Zuhr and bring 'Asr forward, and to perform one Ghusl for both, and to delay Maghrib and bring 'Isha' forward, and to perform one Ghusl for both, and to perform one Ghusl for Subh.  

أَنَّ امْرَأَةً مُسْتَحَاضَةً عَلَى عَهْدِ رَسُولِ اللَّهِ ﷺ قِيلَ لَهَا إِنَّهُ عِرْقٌ عَانِدٌ فَأُمِرَتْ أَنْ تُؤَخِّرَ الظُّهْرَ وَتُعَجِّلَ الْعَصْرَ وَتَغْتَسِلَ لَهُمَا غُسْلاً وَاحِدًا وَتُؤَخِّرَ الْمَغْرِبَ وَتُعَجِّلَ الْعِشَاءَ وَتَغْتَسِلَ لَهُمَا غُسْلاً وَاحِدًا وَتَغْتَسِلَ لِصَلاَةِ الصُّبْحِ غُسْلاً وَاحِدًا  

[Machine] It was narrated that a woman had her menstrual cycle during the time of the Messenger of Allah ﷺ , so she was instructed to delay the Dhuhr prayer and hasten the Asr prayer. She was also instructed to perform ghusl (ritual bath) for them. As for Maghrib and Isha prayers, she was to delay the former and hasten the latter, and perform ghusl for them. She was also to perform ghusl for Fajr prayer. And so on...  

أَنَّ امْرَأَةً اسْتُحِيضَتْ عَلَى عَهْدِ رَسُولِ اللهِ ﷺ فَأُمِرَتْ أَنْ تُؤَخِّرَ الظُّهْرَ وَتُعَجِّلَ الْعَصْرَ وَتَغْتَسِلَ لَهُمَا غُسْلًا وَالْمَغْرِبُ وَالْعِشَاءُ تُؤَخِّرُ هَذِهِ وَتُعَجِّلُ هَذِهِ وَتَغْتَسِلُ لَهُمَا غُسْلًا وَتَغْتَسِلُ لِلصُّبْحِ غُسْلًا وَهَكَذَا