How much is the study visa validity period by which a person has to travel to Canada for study? (I'm not asking about the visa duration, I'm asking about the visa travel validity). I'm having certain issues due to which I wish to defer my admission, but my visa application is already in process. If I'm issued visa to join fall semester, and I dont travel to canada by then, would I have to reapply for visa for the next term I enroll in? or can I travel to canada on the same visa for the next term??