It would probably take a good artist a couple hours just too copy one of Kishis characters well. Kishi has too make different angles of a character(s) and detail in the background in each and every single panel, he cannot just copy a image by looking at another one. Furthermore, he has too think of what they would say that would benefit the plot, which by no means is easy if your trying to make a good story (Which is probably the reason why he failed at last chapter, he went too quick). Making good chapters every single week is a very tough thing too do, especially when you have to satisfy both the people that read it for the plot as well as the people who pay more attention to the actual fights (artwork). People should cut mangakas some slack, especially Kishi, who has been getting way too much hate recently.