It is argued that the Arabic word translated here means periods of time rather than days. If this is the case then we do not know how long each period of time is so the length of each period is. If the periods of time are the same then the Earth would have existed for at least 50% of the life of the universe. The same word is used elsewhere in the Quran to literally mean an Earth day It is for these reasons that mentioning the periods of time is irrelevant and unnecessary, and makes the Quran resemble the incorrect creation story of Genesis.
The verses describe the creation order of the Earth and heavens in the same order as Genesis, which has the Earth and vegetation (sustenance) created before the heavens and the stars, and has the Earth fully formed before the heavens. All of which is scientifically known to be incorrect.