I did say: "This is a process that repeats itself across several thousands of years". I don't have a specific date, but only an order of magnitude. Something in the range of ~25,000 years or less due to it being also in the first and second planetary position phases, where it is still a planet just not as we see it today. Our planet being in the third position is likely much shorter, and I wouldn't be opposed to the possibility of 6,000 years though I am also open to longer ranges if the evidence leads that way. There is a lot to it and evidence can take us away from an interpretation when it may just be misunderstood and so typically I just say "????" when something seems to oppose the biblical interpretation and keep the observations in mind as I keep considering rather than completely abandoning the biblical interpretation as "disproven" by something altogether.
So, for sure not millions or billions of years old. These ranges of dates come from radiometric dating which is a fundamentally flawed process. At best, it is good at showing relative dates but the absolute dates it produces are completely invalid due to the vast array of assumptions being made as I mentioned previously.
I grew up atheist, so I am well acquainted with the philosophy. I would argue that radiometric dating was not sufficiently critically analyzed for its holes or flaws because people literally wanted to prove the bible (and similar interpretations) to be wrong and random chance across billions of years to have a basis. The universe works in funny ways; when we want to believe something sufficiently, even if it is wrong, it can give us the evidence to believe it. Those looking at radiometric dating saw a means to do so and latched onto it and propagated the concepts all while disregarding its extreme weaknesses. The oldest rocks on Earth are still the oldest, in my interpretation from a "Mercury phase", but the actual date of their formation based off radiometric dating does not appreciate that they could have gone through drastic environmental changes. Radiometric dating, from a physics standpoint, depends on the environment because radioactive decay is a function of the environment. If the environment changed substantially, the rate of decay likely changed substantially as well. Regardless of what science may claim, their claims are based on invalid models built on approximations rather than recognition of the infinite nature of the universe.
RE: Earth History: The Himalayas as a Key to Understanding