I don't know if Eliezer has said anything about how long he intends it to be. A new story arc just started, and it's pretty great. It seems like this could go on for a few more years.
He said that he is done through chapter 96, and implied that it might be the end (said at chapter 86 that there were "2 or 3" arcs left, and arcs tend to be about 4 chapters...).
