An Indian national with a permanent residency of Canada is free to enter and exit Canada as they wish. They are allowed to live, stay and work or study in Canada for as long as they want.
The only requirement is to maintain the PR status and ensure its legal validity at all time. They need to adhere to the legal rules after receiving the permanent residency of Canada. Any time the legal rules are not adhered to or violated, the permanent resident status is liable to be revoked.