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. (Using translation from Nasāʾī 213)
أَنَّ امْرَأَةً مُسْتَحَاضَةً عَلَى عَهْدِ رَسُولِ اللهِ ﷺ قِيلَ لَهَا إِنَّهُ عِرْقُ عَانِدٌ وَأُمِرَتْ أَنْ تُؤَخِّرَ الظُّهْرَ وَتُعَجِّلَ الْعَصْرَ وَتَغْتَسِلَ لَهُمَا غُسْلًا وَاحِدًا وَتُؤَخِّرَ الْمَغْرِبَ وَتُعَجِّلَ الْعِشَاءَ وَتَغْتَسِلَ لَهُمَا غُسْلًا وَاحِدًا وَتَغْتَسِلَ لِصَلَاةِ الصُّبْحِ غُسْلًا وَاحِدًا