That is approximately 1/15 of a cup.
Yeah you can. Because you can replace oils for oils and fats for fats, and shortening is both, you can use butter as it is a fat. But since butter has about 15% water, you would have to use a tiny bit less butter or a tiny bit more of dry ingredients. :)
If you put butter sticks in the freezer for 15-20 minutes, it becomes firm enough to dice. Why this would be necessary for any recipe is a curiosity.
15 pints is 30 cups
there are 60 cups in 15 quarts.
15 cups
That is 15 cups
15 cups
That is 30 cups
15 cups
15 cups
30 cups