This will tell you the rough timeline estimates given by CIC when applying outland:
http://www.cic.gc.ca/english/information/times/international/05-fc-spouses.aspIt's saying Islamabad is taking 6-13 months. If your case does go smoothly, it will probably be in the 6-8 catagory, but I'm no expert!
As for staying in Canada, are you just asking for travelling purposes? Or moving to a different country? I'm not entirely sure on this one.