It is narrated from Sayyiduna Abu Barzah al-Aslami (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) used to recite from sixty to a hundred verses in the Fajr prayer.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4014