After 5 years of non-use, your SIN number gets tagged as dormant. You need to visit the Service Center
(or mail in an application) to have the tag removed. The queue is currently 5 weeks. Usually applies
to returning Canadians, but can apply to other folks as well. I was looking for the queue time, and
could not find it. Called in, sat on hold for 30 minutes and I am sharing the info with others. HTH.