"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