Sayyiclina Zayd ibn Thabit (RA) narrated that they had the sahr (pre-dawn meal) with Allahs Messenger Then they went for the salah of fajr. The sub-narrator asked him how much time they had and he said, “What it takes to recite fifty verses”.
[Ahmed21677, Bukhari 575, Muslim 1097, Nisai 2151]