I personally did once every other day (for one book) and twice a week (for another). But, if your novel is finished, do update daily for two weeks, and then consider to schedule 2 - 4 updates a week.
Also, maybe consider the length of the chapters. If each chapter is really short, 3 - 4 a week is alright. If each chapter is kind of long, maybe consider 1 - 2 per week.