Zaid bin Thabit (May Allah be pleased with him) reported:
We took Suhur (predawn meal) with the Messenger of Allah (ﷺ) and then we stood up for (Fajr) Salat (prayer). It was asked: "How long was the gap between the two?" He replied: "The time required for the recitation of fifty Ayat."[Al-Bukhari and Muslim]. (DE)
App reference (DE): Book 9, Hadith 240 (DE)
Arabic/English book reference (DE): Book 9, Hadith 1230 (DE)