GTAs vary in how may classes they teach per year. We recommend teaching at least 2 classes on a single course, as it makes most effective use of your preparation time and gives you as a teacher experience of managing differences between class groups.
More experienced GTAs may teach more than 2 classes or may teach classes for more than one course. We recommend that students do not teach more than five or six classes. Please also note that students are generally restricted to working a maximum of 20 hours per week during term time. This is particularly relevant for overseas students on student visas.
In considering how to structure your teaching, you should factor in the time required each week for preparation, marking and related administration, and office hours. As a guide, if you teach two classes per week, the time for preparation and other duties is included in your contract, which works out at around 7 hours per week. For three classes it is around 8.5 hours per week.
Pay for GTAs varies depending on how many classes you teach. You can see examples of salary for teaching two, three, four or five classes per week here.