This is a little bit tricky:
If you read in this file:
http://www.cic.gc.ca/english/resources/manuals/op/op06-eng.pdfb) Previous study in Canada:
• Award five points if the applicant or accompanying spouse or common- law
partner completed a program of full-time study of at least two years' duration
at a post-secondary institution in Canada, if this occurred after the age of
seventeen and with valid study permits.
(The person is not required to have obtained an educational credential for these
two years of study in Canada to earn the points, but simply to have completed at
least two years of study.)
You only need to study here for two year full-time.