+1(514) 937-9445 or Toll-free (Canada & US) +1 (888) 947-9445
6 months from the day you entered unless they stamped your passport and put a date in the stamp
 
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If you don't remember the exact date you entered, you can order a travel history report from CBSA online. It takes approximately 30 days to process, and about another week or two to get mailed to you. Its a list of all the entry data they have collected whenever you entered Canada and they scanned your passport.