Hadith

Q: With regards to the recitation of Quran, I have found two different hadith:

1. Quran should be read not less then seven days:

Narrated Abdullah ibn Amr ibn al-'As: Wahb ibn Munabbih said: Abdullah ibn Amr asked the Prophet (peace_be_upon_him); In how many days should one complete the recitation of the Qur'an? He said: In forty days. He then said: In one month. He again said: In twenty days. He then said: In fifteen days. He then said: In ten days. Finally he said: In seven days. [Sunnah Abu Dawood]

2. Quran should be read not less then three days:

Abd Allah bin 'Amr bin Al-'As (Allah be well pleased with them both) said that the Messenger of Allah (Allah bless him and give him peace) said: "Whoever reads the Qur'an in less than three days does not understand (what he recited)" Abu Dawud, Al-Tirmidhi, Al-Nasa'i, Bhukari

I have the following question’s:

1. How do we reconcile and understand the about two narrations that mentions 7 days and other as 3 days?
2. Is there any authentic daleel to prove that Quran can be recited in less than 3 days ? Some people say to read Quran in less then 3 days is against the practice of sunnah.
3. I have heard that many salaf have completed Quran many times in less than 3 day? How can we say authenticate this practice and such reports.

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Q: In ramadaan a fardh is multiplied 70, an sunnah equivalent to fardh. If a person were to do a sunnah act his whole life it will not equal to a fardh. If I am not mistaken so with the following two examples I would like to illustrate my view of the sunnah reward. Please advise me weather it is correct or not.

Example 1 : Something to this affect has been mentioned - if one recites surah sajdah and surah mulk between magrib and esha he would the reward of worship on the night of laylatul qadr, aprox 83 years. So now if one does this during any day of ramadaan, it is greater than him doing it his whole life. So it will be as follows 83 * 30  = 2490, 2490 *12= 29880, 29880*60= 1792800 so by a person reading these two surahs in ramadaan between magrib and esha will he be rewarded of a minimum of 1792800 years of worship?

Example 2 : Cleaning the musjid is the dowry for the hoors of jannah. So in this if a person in his entire life was picking up dirt from the musjid, it will not equal to a fardh act but now in ramadaan if he picks one up it will be greater to a person picking up one every second. So will the reward be as follows 1 year = 31 556 926 seconds. so  31 556 926*60= 1893415560 so will the person by picking one dirt in the musjid in ramadaan get 1893415560 hoors in jannah?

Correct me were ever needed and educate me if this is the reward we have been promised and does it apply to all sunnah actions