Thirty minutes, perhaps. It could have taken several hours. The waters from the deep (Genesis chs. 6 and 7) completely deluged the earth in 40 days.
Anyone who knows anything at all about the geology of the Grand Canyon can recognize this as complete lunacy.
Son, there are tens of thousands of laminar layers in the Grand Canyon. Countless of these layers have animal tracks, fossilized raindrop impressions, animal burrows, etc. in them. There's no freaking way that any of these things could be laid down UNDERWATER. Period.
And that's even leaving aside the hundreds of features of the Grand Canyon which were very clearly formed in the way that geologists say it was -- over a millions of years by a river eroding pre-existing strata, which themselves were laid down in separate eras under non-flood conditions. The evidence is vast and overwhelming for anyone who cares to actually check it out, which of course leaves out the creationists.
Here, for example, is a good example of the kind of "doesn't make any bloody sense to anyone with a working brain" stuff the creationists claim about the Grand Canyon, along with my observations on why it's entirely idiotic: My critique of AnswersInGenesis's Grand Canyon blather.
Creationist fantasies about the Grand Canyon being formed in a matter of days under a huge flood are just complete lunacy, and no one with a decent knowledge of the facts and a knowledge of geology beyond the gradeschool level could possibly fall for such twaddle. Deal with it.
Something taking place in a 30 to 180 minute time span within 10,000 years ago...God. Not difficult to comprehend.
Yes, very simple indeed to comprehend. Simple things for simple minds. Unfortunately, it flies entirely in the face of almost every known fact about the Grand Canyon and the laws of physics.
Something happening in a 10 million year period, billions and billions of years ago...Darwinian evolutionist. Wild guesses.
No, those are the conclusions based on vast and overwhelming amounts of independently cross-confirming lines of evidence, amassed by over a century of research by thousands of people. Those conclusions have faced and passed countless validation tests and potential falsification tests. They are as well-established and validated as any conclusion in modern science. Against that reality, the creationists have their wild imaginations, untested against reality (and in strict contradiction to the facts).
But hey, don't let reality stand in the way of what you *want* to believe, if that makes you happy.