depends what level of fat content you want. 40%...50% etc?
Just like milk, cream is fluid because it has moisture...read water.
So, depending on your application, you are the one who should decide how much moisture to add back in.
Less for a good thick alfredo sauce, more if you're going to pour it in your coffee. Play around with a little to see what it gives you, take note of the results and go from there
Cat Man