It is narrated from Sayyidah Zaynab bint Jahsh (may Allah be pleased with her) that she said: I asked about a wife of the Messenger of Allah (peace and blessings be upon him), and said that she was mustahadah (suffering from prolonged non-menstrual bleeding). He (peace and blessings be upon him) said: "She should refrain (from prayer) during the days of her menstruation, then take a ritual bath (ghusl), delay Zuhr and hasten Asr, take a ritual bath and pray; and delay Maghrib and hasten Isha and pray them both; and take a ritual bath for Fajr."
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 20516