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Starting on February 6, 2014 (00:01 EST), all visa applicants will automatically be considered for a multiple entry visa. The visa officer reviewing your application may be able to give you this type of visa even if you applied for a single entry visa.
A multiple entry visa allows visitors to come and go from Canada for six months at a time, without having to reapply each time. It can be valid for up to 10 years, or one month before your passport expires, whichever is earlier. You must arrive in Canada on or before the expiry date on your visa.
GOOD NEWS you no longer need to buy insurance you don't need. You can buy insurance for the duration of your trip and apply for a multiple entry visitor visa. This was a major problem for people that wanted a multiple entry visa for short term visits of 6 month or less.
http://www.stone-hedgefinancialgroup.ca/super-visa-insurance