GotGarlic
Chef Extraordinaire
I only made it the one time; I think a week would be reasonable. You could also make a half-gallon batch to yield about 2 cups, which might be easier to use up.
Yes, the quality of the milk is essential. It has to be fresh whole milk and some cream could be added also.That is actually good. I cannot get even 2 cups of my milk. Of course the quality of the milk matters the most.