If you choose to study full time, you will most likely study four courses each semester. A typical course represents about 10-12 hours of study time per week (including lectures, tutorials, homework, test/exam preparation etc). This means a full time student will need 40-48 hours each week to manage their study load. If you are trying to balance the demands of career and family with study, you could find it easier to choose to study two courses per semester, requiring 20-24 hours per week for the study load.
Each course may differ in the required learning tasks and assessment requirements which may include lectures, tutorials, required reading, exercises and problems, and self-study, along with preparation of assignments, tests or examination. So you can see that the time you spend on campus in class is only a small part of the commitment that you need to make to be successful in your degree. The load can vary, as there occasionally may be busier periods where the workload is very demanding and other times when the load is reduced. Check out the information about your course requirements in each Course Description.
There are some excellent resources available to help you manage your time and your workload, along with the support services across the University that you can access if you need to.