"The Messenger of Allah (ﷺ) used to pray eleven rak'ahs, making it odd (witr) by one between the time when he finished 'Isha and dawn, and he would prostrate for as long as it takes one of you to recite fifty verses before raising his head."
Reference: Sunan an-Nasa'i 1328 In-book : Book 13, Hadith 150 English translation : Vol. 2, Book 13, Hadith 1329
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