The Messenger of Allah ﷺ used to pray eleven units of prayer at night, between finishing the evening prayer and dawn, in addition to the two units before the dawn prayer. He would prolong his prostration for about the time it takes one of you to recite fifty verses.
أخبرنا يوسف بن سعيد قال حدثنا حجاج قال حدثنا ليث قال حدثني عقيل عن ابن شهاب عن عروة
كان رسول الله ﷺ يصلي إحدى عشرة ركعة فيما بين أن يفرغ من صلاة العشاء إلى الفجر بالليل سوى ركعتي الفجر ويسجد قدر ما يقرأ أحدكم خمسين آية
Bukhari narrated it in tahajjud, chapter on the length of sujud during night prayer, no. 1123, and Muslim, etc., no. 736, in the book of the prayer of travelers, chapter on night prayer and the number of units the Prophet ﷺ prayed at night, the hadith of Zuhri, both in its longer and shorter forms. It is also in Sunan al-Kubra, no. 1445...