he had stated in an interview, that the extra citric acid keeps it going so you don't have to drink it all at once and can sip it over a couple of hours if you like. BUT don't forget" then add 2 heaping teaspoons of fructose. Stir until the fructose is dissolved with the citric acid in the glass."
My take is , make it a small volume and gulp it down and get it over with. I don't think I could take it for 2 hours.