I'm almost afraid to say anything because I don't want to confuse anybody further. But, yes, Dr. Schroeder is saying, each 24 hour day, back when the earth was very young, took around 1,000,000,000,000 of our days as we know them now. Of course in the Bible, a day is measured from one sunset to the next so we understand that we are talking about literal 24 hour days. It's just that the days lasted 1,000,000,000,000 times longer than the ones we have now, sunset to sunset.
I know it's confusing, because we are not used to thinking about time that way. As the universe spread out, the days became shorter until we have the length of day as we know them now. Knowing this, we can say, the earth is around six thousand years + 6 days old, the six extra days being before Adam came into the scene.
This accounts for why it seems like the earth is older than it really is. We are measuring time by the way we know it now instead of by the way it was back then.
Now I'm sure I've confused many folks by opening my mouth once again.