Re-apply of Permanent Residence Card

Dear All

First of all Hi to all the Forum members

I need some information regarding the re-apply of permanent residence card. I got the PR card in April 2008 and I went to CA and stayed in CA for 2 weeks. Due to family business I never entered or stayed in Canada. Therefore, my PR card expired in April 2013. Now I want to apply again for Permanent residence card in the same category. I went through the ca web site and found that all the forms (requirements) are same. In this matter I have the following questions

-Can I re-apply for Canada immigration or not. It will be same procedure or there are different ways to re-apply for Canada immigration.
-If yes how much time it will take to get the PR card.
-How should I justify why I did not use my previous PR card.

Thanks in advance