A study permit will be valid for the length of the program of study at the time of application. If the program changes, or the student changes programs to one with a longer duration, the student must apply for an extension of the study permit. When a student completes their studies, the study permit will stop being valid 90 days later, regardless of the date indicated on the permit. Before the study permit expires, the foreign national must exit Canada or apply to extend their stay in Canada. Many students choose to apply for a Post-Graduate Work Permit, if approved, this permit authorizes recent graduates to stay in Canada and work.