Sahih al-Bukhari Book 9, Hadith 52
Anas bin Malik said, "The Prophet (ﷺ) and Zaid bin Thabit took the 'Suhur' together and after finishing
the meal, the Prophet (ﷺ) stood up and prayed (Fajr prayer)." I asked Anas, "How long was the interval
between finishing their 'Suhur' and starting the prayer?" He replied, "The interval between the two
was just sufficient to recite fifty 'Ayat." (Verses of the Qur'an).
Zaid bin Thabit said, "We took the "Suhur" (the meal taken before dawn while fasting is observed) with the Prophet (ﷺ) and then stood up for the (morning) prayer." I asked him how long the interval between the two (Suhur and prayer) was. He replied, 'The interval between the two was just sufficient to recite fifty to Sixth 'Ayat."
I used to take the "Suhur" meal with my family and hasten so as to catch the Fajr (morning prayer) with Allah's Messenger (ﷺ).