question #3 Sahih Muslim 1159d, Book 13, Hadith 238 : What is the significance of reciting the Qur’an within a specific time frame according to Islamic teachings?

The Messenger of Allah (ﷺ) said to me: Recite the whole of the Qur’An during every month. I said: I find power (to recite it) in a shorter period. He said: Then recite it in twenty nights. I said: I find power (to recite it in a shorter period even than this), whereupon he said: Then recite it in seven (nights) and do not exceed beyond it.