day, and then put in the fridge for two more. You then mix that 1:6 with more milk and just keep going. I kefir cream in the same way and then make my own butter - after the 24hrs at room temp, in a half full canning jar, it takes just two minutes of shaking and I have butter! I am always amazed at bodybuilders who spend a fortune on powdered whey (and buy yogurt) when they can have the real version of both cheaper and less processed. Whey still doesn't taste that great on its own, but can be made into some good drinks. A great starting point for barley water, rejuvelac etc.