The point is s-word, that if god made billions of years in 7 days he can collapse billions of years in 7 days. Revelation speaks about this thing happening when the skies are 'rolled up like a garment'.
Heneni
No mate, each day is a period of universal activity, the first universe was nothing but a world of light, nothing else; a world of Giantic first generation stars, each one in time, collapsing in upon themselves after exploding off a percentage of their mass, then there was a period of darkness which to our finite minds would seem as an eternity. The black Holes left by the gravitational death of those first generation stars are the great Gatherers that are spread throughout inter-stella space, which are cathering to themselves the myriads of galaxies that have formed from the material that they expelled by their nova.
The nights and days of Brahma are called Manvantara or the cycle of manifestation, The Great Day that is a period of universal activity, which is preceded, and also followed by Pralaya, a dark period, which to our finite minds seems as an eternity.
Universe after universe is like an interminable succession of wheels forever coming into view, forever rolling onwards, disappearing and reappearing; forever passing from being to non being, and again from non being to being. In short, the constant revolving of the wheel of life in one eternal cycle, according to fixed and immutable laws, is perhaps after all the sum and substance of the philosophy of Buddhism. And this eternal wheel has so to speak, six spokes representing six forms of existence. ---- Mon. Williams, Buddhism, pp. 229, 122.
This view of an eternal oscillating universe is not only held by the Hindu and many from the scientific community, but it is also held by many, many Christians who see the six days of creation as six periods of universal activity and that those universal bodies were the generations of the universe that led to the body in which a mind capable of comprehending mind, had evolved.