Silas spent 2 to 3 days to find all of the people who knew his name and interrogated them to find out if they told anyone about his name. He didn't eat or sleep, mostly because he didn't feel like it at the time. He felt like this many times in the past, but he always felt like resting his mind was important.
Maybe because it was the only thing that made him feel human, despite all the things that he's done.
Despite all the things that he's seen.
Despite all the things he's been blessed with in this world.
But that wasn't the point. He was here to hunt the people who knew about what he had become, and he was slowly gaining more knowledge, not only about himself when he had apparently turned into an eldritch terror, but also about the kingdom.