If he continues to write at this rate, and the book is 52 chapters (I think someone said that's the average length), he will be done on April 14th, I think. I did the math, but did it days ago. Just get 12/7/18 to 1/17/19 to get the amount of time he has written, then do 41 minus 36 to get the chapters he has written, then divide the two, then do 52 minus 41 to get the estimated chapters remaining, then multiply the answer from the division by that number. Then add however long for it to get published.