It depends on the number of articles pending for review and availability of editors. Generally it takes few days to few weeks. If you see your article is pending for review for about 1 month, then you can raise the concern in forum.
Caution: Explosive. Handle with care.
You cannot submit an article at ISC which is already submitted elsewhere. It will not be reviewed by editors at all till it is removed from other sites/blogs, but will be deleted right away.
When people come at you with their worst, you should come at them with your best (advice given to Selena Gomez by her mother, quoted in Time magazine.)