When your Domain name Expires the following processes will follow 30 days to renew domain name after date of expiration, 30 days in redemption cost at this stage is about $100, 15 - 20 days pending delete
So in total the domain deletion cycle is about 80 days from the expiration date of the domain name to have it registered as a new domain name. You may wish to backorder your domains before they are deleted this way you get the first choice to have it registered once deleted. Every domain name must be renewed to keep them up and active.