The Prophet ﷺ said: He who recites the Qur'an in a period less than three days does not understand it. (Using translation from Abū Dāʾūd 1394)  

قَالَ رَسُولُ اللَّهِ ﷺ «لَا يَفْقَهُ مَنْ قَرَأَ الْقُرْآنَ فِي أَقَلَّ مِنْ ثَلَاثٍ»