Al-Muzzammil • EN-AL-JALALAYN
﴿ إِنَّ لَكَ فِى ٱلنَّهَارِ سَبْحًۭا طَوِيلًۭا ﴾
“whereas by day a long chain of doings is thy portion.”
For assuredly during the day you have extended engagements administering your affairs and you do not have the time to recite Qur’ān.