The diner was in fact open 7 days a week. Alice said in "Love is a Free Throw" that it was rare that Mel would give her both Saturday and Sunday off.

The diner was in fact open 7 days a week. Alice said in "Love is a Free Throw" that it was rare that Mel would give her both Saturday and Sunday off.
Ok, we will have to note this somewhere for future reference. :D

I could have sworn that it was said one time that the diner was closed on Sundays. It could have been said merely for the storyline.

I will have to catch each episode from now and pay real close attention.