Depending on the TLD, a domain name at NameSilo can be deleted after more than 70 days. For example, .blackfriday domains are deleted after 220 days.
Let’s take it from the beginning:
When a domain expires, a few days after expiration it becomes available for auction/bidding until day 31:
https://www.namesilo.com/Marketplace
If there are bids, the domain is awarded to the highest bidder unless the previous owner renews it.
If the domain has no bids and the old owner still hasn’t renewed it, it enters the Restore Period (about 30 days), during which the previous owner can still renew it.
After the Restore Period, it moves to Pending Delete. During this phase, the domain can be caught by services such as catch.club.
From what I know, all expired domains at NameSilo go through the auction phase. If the current owner renews the domain during the Restore Period, it is returned to them.
Once the domain finally drops, drop-catching services try to acquire it and may run their own auction for the caught domain.