1 hour and 20- 1 hour and 30.
The problem with this argument that everything just "sped up" during the creation event, This idea that plants just grew super fast and that continents moved super fast and the speed of light moves super fast and speciation occurred super fast, the problem is that these events are the same events that have unfolded within strata, allegedly deposited by this hypothetical flood in a post-day 6 world of Noah.
There are the hypothetical literal 6 days of creation themselves, and then there are hypothetical things that unfolded during the days of Noah, but a lot of the "what strata is pre-flood" and "what strata is post-flood" is continually confused and intermingled with one another by YECs. And their confusion is justified, because the moment we begin unravelling their beliefs to try to rationalize ideas, we are soon met with innumerable logical obstacles and contradictions. Example below:
Here is fossil grove (see image above), And someone could argue that maybe these plants grew super fast, and that's how a forest managed to come about in 6 days. But the problem is that this Forest rest in between the very layers that are suggested to have been deposited by a hypothetical flood. More specifically, this particular forest which is one of many happens to be in carboniferous strata, Which is below strata of the Permian but above strata of the devonian, and was simply uncovered by quarry activities.
And so it could not possibly have been anything but in-situ growth of an entire forest, mid-flood.
YECs have countered with this strange idea that thesw forests rested atop floating islands of vegetation and that this just happened to settle out in a particular area. But this response is irrational in that these forests are rooted in prehistoric soils (paleosols) with a, b, c and o soil horizons, and in some cases even happen to have things like animal trackways going through these soils along grade just as we would see around a tree outside in our own neighborhoods. And of course soil is more dense than water and doesn't float. Oftentimes these forests and their formations span dozens of kilometers, and consist of soil and gravel and silt and clay, So the idea that this massive chunk of land was just floating and just settled out somewhere, it's pretty wild when you think about how many physical laws we would have to ignore to make this happen. Where did this massive chunk of land come from? YECs never give evidence for where they from, or they could float. And the idea that there was enough force in this flood to lift this mass of soil and to hurl it hundreds of kilometers somewhere else. All the while life is just on it living and growing and walking around.
Alternatively some YECs argue that these forests must be "pre-flood" forests of the original 6 days of creation. But this doesn't make sense given that they rest within and make up carboniferous strata, well deep into the geologic column and we'll into the paleozoic.
So YECs can't agree and neither YEC position makes sense.
But it gets worse.
Old Earth Geology Part 3 (Green River Formation)
See the above link.
There are over 5 million varves in the green river formation that span several kilometers in length.
A young earth creationist could say that maybe things were just faster in the past. But when we actually think about it and look at the numbers, it just doesn't add up.
The flood was considered to have occurred over the span of a year, many YECs suggesting that the flood subsided in roughly 6 months of time.
So 5,000,000 varves divided by 6 months is 833,333 varves per month. That's about 27,777 varves per day, 1,332 varves per hour or 22 varves per minute. Every varve is a couplet, one dense layer of sediment and one less dense, so that's 44 individual layers deposited over tens of kilometers in distance per minute.
Meaning that if we were to try to envision this idea of fast-forwarding time, we might see waves of water carrying sediment traveling at
dozens of kilometers per second back and forth (east and west?) millions of times, right in the middle of this hypothetical global flood.
This is so radically irrational. Waves moving at dozens of kilometers per second back and forth?
But the madness doesn't stop there.
To make matters worse, there are fossil footprints between varves of the green river formation (such as bird foot tracks). So not only do we have waves traveling at dozens of kilometers per second carrying sediment at dozens of kilometers per second in fast forward, but you also had animals walking around and living in this environment. How could it be? Did these animals also move at the mocha 10 speeds to walk among these hypersonic waves? Animals also traveling in fast forward, hit the fast forward button. Animals building nests, laying eggs and digging complex burrow networks, entire forests growing within and in between the same layers that YECs are saying we're instantaneously laid down by a hypothetical flood.
YECs keep trying to hit that fast forward button on reality, but it logically creates an excessive number of issues with everything from starlight speeds, to speciation speeds and continental motion and isotope decay speeds and varve formation speeds and fossil grover in situ forest growth speeds (mid layer within layers deposited by this hypothetical flood), and much much much more.
The issues are truly countless.
So not only would God have had to have sped up the growth of plants and the speeds at which water would move and soil would move and light would move in ways that would all defy physics, But God would also have to speed up the motion and activity of animals on Earth to be able to do things like walk fast (like speed of light fast) and make nests and lay eggs and feed (feeding traces of many grazing animals are also observed in the fossil record). Life itself would have had to have also been sped up millions of times faster than what we currently observe today in order for the fossil record to make rational sense in a young Earth view.
In my opinion this is crazy. And the much more simple and reasonable conclusion is to just accept that the Earth is millions of years old Rather than believing that everything simply unfolded millions of times faster than is observed today. Especially when these features post date the original creation story and are observed to have unfolded within layers that were allegedly deposited in the time of Noah (which therefore wouldn't be subject to God's creative expediting of time anyway).
But wait, there is more.
So take your fossil grove and then put your eocene varves above it, and this still only accounts for a very small fraction of an overall much more vast quantity of events and strata of dozens of other layers of rocks above and below these two formations. Even by just looking at just these two formations and ignoring the other 99% of layers and formations above and below them, we see these extreme logical issues with the young Earth position even when just trying to account for a mere fraction of the much greater succession of rock above and below these two formations.
Which is to say that the YEC position can't even logically account for the smallest amount, the smallest percentage and fraction of earth history, let alone all of it.
Whereas if we had millions of years to work with, it would be quite easy to explain the Green River formation as a lacustrine varve deposit and the fossil grove site simply as a prehistoric forest that had plenty of time to grow as an independent ecosystem during the carboniferous period.