Average weekly hours for a psychologist?

They are totally variable: full time, part time, daytime, nighttime. Professional consultants can set their own hours and negotiate with clients. If you work full-time hours in a certain shift at a hospital, your working hours are going to be different from those of a therapist who sees private clients after the hours of a normal workday. If you work for a company, you may keep normal business hours, and if you lead all-day group workshops, maybe you will mostly work on weekends.