A Single Entry Canada Visitor Visa is valid for a maximum of 6 months. This Visa only enables you to visit Canada once. With a Multiple Entry Visa, you can visit Canada for up to 6 months at a time and as many times as you like throughout the validity period. It will be valid for a maximum of ten years or one month before the expiration of the Passport, whichever comes first. You must enter Canada on or before the visa's expiration date.