Is the Hadith of Sa’d ibn al-Mundhir al-Ansari evidence for the Sunnah of completing the Qur’an every three days? And what is the indication of the Hadith?

The aforementioned hadith indicates the permissibility of completing the recitation of the Qur'an in three days for those who are able to do so, provided it is done with contemplation and clear recitation. None of the scholars have stated that completing the Qur'an in three days is a Sunnah; rather, it has been reported that whoever recites the Qur'an in less than three days does not comprehend it. Al-Ghazali mentions that reading the Qur'an has three levels: the lowest is completing it once a month, the highest is completing it once every three days, and the most balanced is completing it once a week.