We ate the pre-dawn meal with the Messenger of Allah ﷺ, then we rose for the prayer.I asked, "How much time was there between the two?"He replied, "About the time it takes a man to recite fifty verses."
أخبرنا إسحق بن إبراهيم قال حدثنا وكيع قال حدثنا هشام عن قتادة عن أنس
تسحرنا مع رسول الله ﷺ ثم قمنا إلى الصلاة قلت كم كان بينهما قال قدر ما يقرأ الرجل خمسين آية
Muslim narrated it in the Book of Fasting, chapter "The Merit of Suhur and the Emphasis on Its Desirability," etc., hadith no. 1097, from the hadith of Waki bin Jarra, and Bukhari narrated it in the Book of Fasting, chapter "How Long Was There Between Suhur and the Prayer of Fajr?", hadith no. 1921, from the hadith of Hisham Dastawai, with the same wording.