ENOfficial
Jundub b. ‘Abdallāh reported God’s messenger as saying, “Recite the Qur’ān as long as you can concentrate on it, but when your concentration flags give it up.” (Bukhārī and Muslim.)
Source: sunnah.com
Other translations
Arabic
وَعَنْ جُنْدُبِ بْنِ عَبْدُ اللَّهِ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم: «اقرؤوا الْقُرْآنَ مَا ائْتَلَفَتْ عَلَيْهِ قُلُوبُكُمْ فَإِذَا اخْتَلَفْتُمْ فَقومُوا عَنهُ»
sunnah.com