Muwatta Malik · Hadith 480
وحدثني عن مالك، انه بلغه ان عبد الله بن عمر، مكث على سورة البقرة ثماني سنين يتعلمها
Yahya related to me from Malik that he had heard that it took Abdullah ibn Umar eight years to learn Surat al-Baqara. (Sura)
Mauquf Daif · Salim al-Hilali