so if i have a multiple entry visa and want to leave canada after my 6months duration , should i apply for an extendion of visitors visa?you can leave Canada but I dont think you can re-enter Canada by just having OWP(normally it clearly states on the OWP that it doesnt allow re-entry), Depending upon what is your country of Citizenship you will need eTA or Multiple Entry Visa(TRV) on your passport. I am not 100% sure , maybe some senior member can help you further.