You can get PR in 1 year course also. it all depends on which course you choose, how you get job, what kind of job you get and most importantly which student immgrtaion programme you choose.
There are various kinds of student immgrtaion programmes like the Federal CEC or many other Provincial nominee programmes each having it's own criteria.
Here's a very good previous post about various student immigration programmes for international students in Canada. You can go through all the official links and decide for yourself, as to which may be more suitable for you depending upon availability of course, province choice etc.