Yes, Apognophos, I conceded that in my comment. It is very difficult to nail down. However, just for accuracy's sake, I think they no longer accept the 7,000 years either. Here is part one of their answer:
Length of the six days of creation. Some creationists assert that the six days of creation were literal 24-hour days. But the word “day” in the Bible can refer to a considerable length of time.—Genesis 2:4; Psalm 90:4.
Later, they've taken to referring to those 'days' as time periods, leaving them undefined.
They are in a pickle! They are concerned that they look scientific, but at the same time, their belief is not supported by science, and they don't know what science will come up with next. They've had a number of humiliating mistakes where they have had to rewrite past understandings.
Their other problem is that they don't want to be identified too closely with other creationists. In fact, they insist that they are not creationists because they don't believe in 24 hour creative days.
I agree that they are a strange mixture of old-young earth creationists, but I would add one more descriptor. old-young-undetermined creationists. I believe they are leaving this ambiguous on purpose. They don't want to be identified as creationists, yet they are creationists, so that moves them to be vague.
Bloody Hotdogs! I think in the end, you will not get a clear answer, and that's on purpose. Also, I think if you do some research, there is a great deal of scientific commentary on the flood. You are considering two options, but there are many more.
Here is one problem with the water canopy hypothesis:
Vapor canopy. This model, proposed by Whitcomb & Morris and others, proposes that much of the Flood water was suspended overhead until the 40 days of rain which caused the Flood. The following objections are covered in more detail by Brown.
- How was the water suspended, and what caused it to fall all at once when it did?
- If a canopy holding the equivalent to more than 40 feet of water were part of the atmosphere, it would raise the atmospheric pressure accordingly, raising oxygen and nitrogen levels to toxic levels.
- If the canopy began as vapor, any water from it would be superheated. This scenario essentially starts with most of the Flood waters boiled off. Noah and company would be poached. If the water began as ice in orbit, the gravitational potential energy would likewise raise the temperature past boiling.
- A canopy of any significant thickness would have blocked a great deal of light, lowering the temperature of the earth greatly before the Flood.
- Any water above the ozone layer would not be shielded from ultraviolet light, and the light would break apart the water molecules.
http://www.talkorigins.org/faqs/faq-noahs-ark.html