No Charlie, it's 2 years out of 5. It used to be at least 183 days a year. The interesting thing is that it is a moving window. Seems only Canada has it. But the health care system is the one that is more restrictive. You cannot be absent from canada for more than 183 days in a year, otherwise the healthcare insurance wont cover you, and if you make claims in the subsequent year for costs incurred in the year you understayed, you have to pay back those claims. And if you are continually absent year on year, they will review your status entirely and withdraw any health insurance from you. But this wont affect your PR status.