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). (Using translation from Bukhārī 576)
أَنَّ نَبِيَّ اللهِ ﷺ وَزَيْدَ بْنَ ثَابِتٍ تَسَحَّرَافَلَمَّا فَرَغَا مِنْ سَحُورِهِمَا قَامَ رَسُولُ اللهِ ﷺ إِلَى الصَّلَاةِ فَقُلْنَا لِأَنَسٍ كَمْ كَانَ بَيْنَ فَرَاغِهِمَا مِنْ سَحُورِهِمَا وَدُخُولِهِمَا فِي الصَّلَاةِ؟ قَالَ قَدْرَ مَا يَقْرَأُ الرَّجُلُ خَمْسِينَ آيَةً