The Interval Between Suhur and Fajr

Narrated Anas:

Zaid bin Thabit said, “We took the Suhur with the Prophet . Then he stood for the prayer.” I asked, “What was the interval between the Suhur and the Adhan?” He replied, “The interval was sufficient to recite fifty verses of the Quran.”

Translation of Sahih Bukhari Volume 3, Book 31, Number 144