Changing the School Week

Which would you rather have: a four-day school week with more hours per day, or a five-day school week with the hours you have now?

Persuade me that your choice is best.

YOU MUST TAKE A STAND!!!!
I do not want answers that say, "Well, I can see why X is good, but I can also see why Y is okay."
JUST PICK ONE AND DEFEND IT.