Abu Hamzah (may Allah be pleased with him) related: I said to Ibn Abbas (may Allah be pleased with them both): I recite the Qur'an very fast; I recite the (whole) Qur'an in three (days)! He said: That I should recite only Surah al-Baqarah in one night, reflecting on it and reciting it slowly and distinctly, is more beloved to me than that I should recite the way you do.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 4060