Why 7 days for Creation?

See, neologist, people clown with the notion, because it is meaningless in the real world. You make up a dumb answer or ape other dumb answers because there is no answer. The universe never rests, and if it be misnamed god, through anthropomorphism, still it has no mechanism for taking the day off.

The 7 day week predates the Bible by centuries, so I doubt the Bible is the source of the system.

Why seven days for creation? If you saw it after, you wouldn't have had to ask. It's the most beautiful thing that ever was... believe me.

Probably the simplest answer is the best. 7 days from the full moon to the half, 7 from the half to the new moon, 7 from the new to the half, 7 again from the half to the full.

...and since humans have spent hundreds of thousands of years as hunter-gatherers, the moon and it's phases would have been very important to them.
When to leave on a hunting trip, how many days have we been gone?, when should we start back?, etc. The number is also reflected in the human menstrual cycle.

Because God was a good Christian, and believed in honoring the Sabbath.

He created the world in 6 days and rested on the 7th, like a Christian should.

God was in a hurry !

I like that idea. Lunar cycle. Is there any evidence for it, or is it just logical?

I certainly didn't come up with this idea. I read a paper written by some anthropologist. I wish I could be more specific. There was something about why women who live together for some time eventually sync up their menstrual cycles. The theory went something like this: The men of the clan would hunt together for weeks at a time. When they got back they would naturally want a little action from the ladies. So it makes sense that the women would be fertile at this time. Or at least at the same time, so as not to give some an advantage over the others. I think if you search for the reason why women's cycles sync up you might find this paper.

http://www.bbc.co.uk/religion/0/20394641

This is a more modern origin; since the development of agriculture. I'm talking about the time before when we made our living as hunter-gatherers.
So between 200.000 and 10,000 years ago.

The sabbath is Saturday.

The definition of a "day" should also be considered, if this all happened before time existed...

When he rested on the 7th day, how many years was that?

Are you talking brownian motion?

The number seven is used frequently in the Scriptures to signify completion.

Sincerely Meem

G-d created the world in six days;
On the seventh day He rested and let the thing into orbit swing.
A billion years or so went by and He took a look at the whirling blob.
His spirits fell as He sighed, "Oh, well."
It was only a six day job.

I will bypass the actual question and get out commenting the Creator lacked the imagination to keep going on creating stuff...

It was 6 days with 7th day being rest..

When did god create earth? How about the moon?