Why not 7-4?

Why do sheep works 8 (or even 9) hours per day, 5 days per week, instead of 7 hours and 4 days?

Do you think I am crazy? Well, I have an simple experiment for you: try to find in Google (a Jewish search engine) the history of the weekend. You will find absolutely nothing. Not even in Wikipedia (except for a small paragraph about how hard was the life in the 19th century). In fact the only article you will find, if you search hard enough, is this one: http://groups.csail.mit.edu/mac/users/rauch/worktime/hours_workweek.html

A thirteenth-century estime finds that whole peasant families did not put in more than 150 days per year on their land.

Modern history calls those times the ``Dark Ages''.

http://en.wikipedia.org/wiki/Sabbath

Don't you know about the holy days? Why do you think the week has seven days? Why is a month around thirty? Keep working, goy, this is none of your business. We'll decide the standards for you.