The length of time that a Canadian visitor visa is valid for depends on a number of factors, including the purpose of your visit and the length of time that you plan to stay in Canada. In general, visitor visas are valid for a specific period of time, typically 6 months or less. This means that you must enter Canada within the validity period of your visa and stay for the length of time permitted. If you want to stay in Canada for longer than the validity period of your visitor visa, you will need to apply for an extension before your visa expires. You can do this by completing the appropriate application form and submitting it to Immigration, Refugees and Citizenship Canada (IRCC). You will need to provide evidence to support your request for an extension, such as proof of financial support and a letter explaining the reasons for your request. It’s important to note that visitor visas are not automatically extendable, and extensions are not guaranteed. You should apply for an extension as early as possible to give yourself plenty of time to receive a decision before your visa expires.