"If a Muslim doesn’t finish reciting the Qur’an in Ramadan—the month of the Qur’an—then chances are, they won’t finish it during the rest of the year unless Allah wills otherwise.
Not completing it is a sign of neglect, and it’s a reason to keep praying for Allah to remove this state of heedlessness from the heart."
Sifat al-Safwah (2/47)