Ikhlas equals a third of the Qur'an
إِنَّهَا تَعْدِلُ ثُلُثَ الْقُرْآنِ
Innaha ta'dilu thuluthi-l-qur'an.
"Indeed, it equals a third of the Qur'an."
Narrated by Abu Sa'id al-Khudri. Sahih al-Bukhari 5013, Sahih Muslim 811
A short reflection
Four short verses. Three minutes to memorise. Three times equals a recitation of the entire Quran in reward, by the most common interpretation.