Wa Alaikum As'salam,
Jazaka Allah Khayr for this discovery, akhi. We can't, however, give an exact number on how many days is a Day at the Throne of Allah Almighty. Time in the Glorious Quran is relative. A day's length is determined by Allah Almighty:
[032:005] He rules (all) affairs from the heavens to the earth: in the end will (all affairs) go up to Him, on a Day, the space whereof will be (as) a thousand years of your reckoning.
[070:004] The angels and the spirit ascend unto him in a Day the measure whereof is (as) fifty thousand years:
Here we have a Day being 1,000 years, and another Day being 50,000 years of what we measure. So a Day at the Throne of Allah Almighty is different. Our mathematics, physics, space and time and realm can not encompass this Divine Science of Time Relatively. All Praise and Glory and Thanks and Worship are due to Allah Almighty alone, and none else.
I will insha'Allah add your piece and my reply in the next update.
Take care,
Osama Abdallah