The Messenger of Allah ﷺ used to delay the evening prayer until the first third of the night, and he disliked sleeping before it or engaging in conversation after it. In the dawn prayer he would recite between sixty and a hundred verses, and he would finish the prayer at the time when we could recognize one another's faces.
كان رسول الله ﷺ يؤخر العشاء إلى ثلث الليل، ويكره النوم قبلها، والحديث بعدها، وكان يقرأ في صلاة الفجر من المائة إلى الستين. وكان ينصرف حين يعرف بعضنا وجه بعض.
Muslim narrated it in the Book of Mosques (647) through Hammad bin Salama, from Sayyar bin Salama Abu Minhal, who said, I heard Abu Barza Aslami, and he related the hadith. This is part of the long hadith about the times of prayer, which the two Shaykhs agreed to record in scattered fashion. Bukhari recorded it in the Book of Adhan, chapter on recitation at Fajr, through Shuba, who said, Sayyar bin Salama narrated to us, saying, My father and I went to Abu Barza and asked him about the time of prayer, and he related the hadith, which includes, "He would recite in the two rakahs, or in one of them, somewhere between sixty and a hundred verses." Muslim also recorded it in the Book of Prayer (461) through two other routes from Abu Minhal.