Dr Now said close to 10K. I am guessing it should be 9300-9700 a day. Assuming he is what in imperial is 5'10 he would need 5125 calories to maintain 735 pounds, a good 5700 to maintain 843. He gained, he gained hard, 10K a day could be a low estimate. But it takes a good effort to down that much food, you have to be in serious denial to tell everyone you have been sticking to any kind of diet.