Yes you can stay as many days as you like .. You are PR after all. No PR card of PRTD is needed to cross land border. You only need stamped COPR.Folks who did soft landing from US to Canada via Land, would you be allowed to stay for couple of days in Canada to apply for SIN and come back to US? Also, can we return to Canada via road from US permanently later (in a month) without PR card or PRTD?