He is the One who created the heavens and earth in six days, and His dominion was upon the water, and to test who from amongst you works the best. When you say, "You will be resurrected after death." those who rejected will say, "This is but clear magic!"
Translation endnotes
[11:7] The expression "six days" provide comparison. For instance, we learn that though the creation of galaxies took two days, the creation of earth to be habitable for life took four days (41:10-12). In other words, the creation of earth started 13.7 billion x 4/6 years ago. As for time, the Quran informs us that it is relative (32:5 and 70:4). The earth was initially covered with water; lands emerged later.