You generally take a minor in your third or fourth year. Before you can start your minor, you must have passed your first-year examination. If there are specific entry requirements for the minor that you want to take, you must also be able to demonstrate that you meet these.
All minors start either in August/September (terms 1-2) or in February (terms 3-4). You will be working full-time on your minor during these six months, as you would do for an internship.