Hope this will halp:
Appendix A: Residency obligation
You must meet the residency obligation to obtain a Permanent Resident Card. If you have been a permanent resident for five years or more: you must have been physically present in Canada for a minimum of 730 days within the past five years. If you have been a permanent resident for less than five years: you must show that you will be able to meet the minimum 730 days in Canada at the five-year mark.
http://www.cic.gc.ca/english/informa...des/5445EA.asp