It was narrated from Anas that Zaid bin Thabit said:

"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."

أَخْبَرَنَا إِسْمَاعِيلُ بْنُ مَسْعُودٍ، قَالَ حَدَّثَنَا خَالِدٌ، قَالَ حَدَّثَنَا هِشَامٌ، قَالَ حَدَّثَنَا قَتَادَةُ، عَنْ أَنَسٍ، عَنْ زَيْدِ بْنِ ثَابِتٍ، قَالَ تَسَحَّرْنَا مَعَ رَسُولِ اللَّهِ ﷺ ثُمَّ قُمْنَا إِلَى الصَّلاَةِ . قُلْتُ زُعِمَ أَنَّ أَنَسًا الْقَائِلُ مَا كَانَ بَيْنَ ذَلِكَ قَالَ قَدْرَ مَا يَقْرَأُ الرَّجُلُ خَمْسِينَ آيَةً .