[JohnnyM]

"how can we make any suggestion at how long a 'day' is before the earth is there to revolve?"

You are not reading your Bible. The earth was there at Day 1.

JM

[tjwmason]

You are not reading your Bible. The earth was there at Day 1.

I don't think so, if I may quote:

"In the beginning God created heaven and earth. And the earth was void and empty, and darkness was upon the face of the deep; and the spirit of God moved over the waters. And God said: Be light made. And light was made. And saw the light that it was good; and he divided the light from the darkness. And he called the light Day, and the darkness Night; and there was evening and morning one day." Genesis 1:1-5 [emphasis mine]

The only mention of the earth is as being 'void' it is not until verse 9 than we get anything like the planet coming into being.