Within what time limit must I land in Canada after the application for immigration of parents' reunion in Canada is approved?

Please remember that the last landing time (or effective time) of all immigrants in Canada after obtaining visas is within one year of immigration physical examination and crime-free notarization. . . . This is the expiration date. Only one party's immigration medical examination or notarization of no crime for more than one year will invalidate your immigration visa, so please pay attention to these two documents and the notarization time.