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To be eligible to apply for Criminal Rehab, five years must have passed since the completion of your sentence which includes payment of fines, driving courses, community service, probation, and any other conditions which may have been imposed on you.
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If it has been more than ten years since the completion of your sentence, and you have nothing else on your criminal record, Canadian immigration authorities may disregard your prior DUI conviction and allow you to visit the country. If you have two or more drunk driving violations or other excludable criminal convictions on your record, however, you will never be deemed rehabilitated by virtue of time and may be inadmissible to Canada without a Temporary Resident Permit or Criminal Rehabilitation even 20+ years later.