"We had Sahur with the Messenger of Allah then we went to pray." I (one of the narrators) said: "It is claimed that Anas said: 'How long was there between them?' He said: 'As long as it takes a man to recite fifty verses." (Using translation from Nasāʾī 2156)  

تَسَحَّرْنَا مَعَ رَسُولِ اللهِ ﷺ ثُمَّ قُمْنَا إِلَى الصَّلَاةِ قُلْتُ زُعِمَ أَنَّ أَنَسًا الْقَائِلُ مَا كَانَ بَيْنَ ذَلِكَ قَالَ قَدْرُ مَا يَقْرَأُ الرَّجُلُ خَمْسِينَ آيَةً  

"The Messenger of Allah and Zaid bin Thabit had Sahur, then they went and started to pray Subh." We said to Anas: "How long was there between their finishing and their starting to pray?" He said: "As long as it takes a man to recite fifty Verses." (Using translation from Nasāʾī 2157)  

تَسَحَّرَ رَسُولُ اللهِ ﷺ وَزَيْدُ بْنُ ثَابِتٍ ثُمَّ قَامَا فَدَخَلَا فِي صَلَاةِ الصُّبْحِ قُلْنَا لِأَنَسٍ كَمْ كَانَ بَيْنَ فَرَاغِهِمَا وَدُخُولِهِمَا فِي الصَّلَاةِ؟ قَالَ قَدْرُ مَا يَقْرَأُ الْإِنْسَانُ خَمْسِينَ آيَةً