I spent a night with my maternal aunt Maymunah. The Prophet (ﷺ) got up to pray at night. He prayed thirteen rak'ahs including two rak'ahs of the dawn prayer. I guessed that he stood in every rak'ah as long as one could recite Surah al-Muzzammil (73).
Reference: Sunan Abi Dawud 1365 In-book : Book 5, Hadith 116 English translation : Book 5, Hadith 1360
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