It depends a lot on you (how smart, study habits, reading speed, etc) and a lot on what you're taking (quantum physics or business admin), and also where you go (community college or Reed).
The general suggestion from colleges is one hour of study outside of class per credit per week at a minimum. That's often higher for labs, and definitely higher at rigorous institutions.
Here's a typical workload for a low-midrange school for a 5 credit class on the quarter system (ie you have 11 weeks)...multiply this by 3-4 for the full workload:
Objective Exams:  		Primarily this is a writing class, synthesis essays are the major source of evaluation. Two or three objective exams will be given as a way for you and the instructor to check retention of the course material.  These exams will consist of multiple choice, true/false, short answer, and short essay questions.  
Short Essays: 		This writing is a way for you to analyze theories, research, and concepts ? as well as to express your thoughts, feelings, and critical insights concerning Abnormal Psychology and prepare for class discussion.  Short Synthesis essays will be written about the concepts and theories addressed in the course textbooks and classroom presentation. They must include a thesis statement with support using the assigned weekly readings, including analysis of specific concepts or theories, personal experiences or observations, speculations, as well as applications and explorations that are outlined in lecture and reading assignments for the week. These writings should not be confused with personal "Diary Type" information about self.  The instructor will give specific questions and/or assignments for your Short Synthesis Essays. These entries are your preparation for classroom discussion and reveals to the instructor that you are critically engaging the readings.  Short Essays must be a minimum of two (2) word-processed pages, and you are strongly encouraged to write more.  One Short Essay per week is required unless otherwise assigned, late Essays will receive less or no credit.  Number and date each entry, if an assigned entry, title it.  The instructor will read these Essays and return them to you promptly.  
Research Paper:	     One 12 to 15 page research essay will be developed during the quarter with a Paper completed paper due in the last week of class.  More than a report of research on a specific topic, your paper must have a point of view.  That is, you are to develop a perspective (an argument) on a particular abnormal psychological issue, theory, or disorder; and investigate the available research to support this. Thesis Statement Example: Dissociative Identity Disorder (multiple personality) is an erroneous diagnosis that originates in the patient as a result of the suggestions made by the psychiatric professionals providing treatment.  As well, you will include connections to related literature and/or film.  Additionally, make sure to address the research of opposing perspectives.  A timeline with due dates will be handed out in the first week of instruction.  In the final week of instruction you will be asked to present the findings of your research to the class - Additional information and guidance will be provided.  Get started right away.  (Also required: Annotated bibliography and First draft.)
Texts/Readings:      1-2 textbooks (average 200-600 pages), about 1/2 - 2/3  of which are covered. 2-4 additional books (usually under 200 pages). Any number of handouts, journal articles, etc.