حَدَّثَنَا عَلِيُّ بْنُ مُحَمَّدٍ، حَدَّثَنَا وَكِيعٌ، عَنْ هِشَامٍ الدَّسْتَوَائِيِّ، عَنْ قَتَادَةَ، عَنْ أَنَسِ بْنِ مَالِكٍ، عَنْ زَيْدِ بْنِ ثَابِتٍ، قَالَ تَسَحَّرْنَا مَعَ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ ثُمَّ قُمْنَا إِلَى الصَّلاَةِ ‏.‏ قُلْتُ كَمْ بَيْنَهُمَا قَالَ قَدْرُ قِرَاءَةِ خَمْسِينَ آيَةً ‏.‏

It wasnarrated from Anas bin Malik that Zaid bin Thabit said: “WeateSuhur with the Messenger of Allah (PBUH) then we got up to performprayer.” I said: “How long was there between the two?” He said:“Aslong as it takes to recite fifty Verses.” Translation Not Available

Book Ref: Sunan Ibn Majah Book 7 Hadith 1694
Web Ref:  Sunan Ibn Majah Vol 1 Book 7 Hadith 1694