Muwaththa' Malik · #480
وَحَدَّثَنِي عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، مَكَثَ عَلَى سُورَةِ الْبَقَرَةِ ثَمَانِيَ سِنِينَ يَتَعَلَّمُهَا .
English
Yahya related to me from Malik that he had heard that it took Abdullah ibn Umar eight years to learn Surat al-Baqara. (Sura)