I asked Anas about the recitation of the Prophet ﷺ, and he replied that he used to draw out his pronunciation, prolonging the elongated letters.
حدثنا مسلم بن إبراهيم حدثنا جرير
سألت أنسا عن قراءة النبي ﷺ فقال كان يمد مدا
Bukhari, Merits of the Quran, chapter on prolonging the recitation, hadith no. 5045, from Muslim bin Ibrahim.