An unknown period of time passed before Silas' was finally done speed reading the document.
The file that occupied a massive storage space of more than 3TB, even in its compressed state, was completely absorbed by Silas.
The reason why Silas was able to speed read and absorb all the information in the file was because of his eidetic memory. Something he got after he raised his intelligence stat to its limit.
Silas' reason for improving his knowledge base, even though the knowledge and information are already in LUNAR's database is because he felt the need to.
He knew that he can't always depend on LUNAR. Besides the actual reason why he created LUNAR is because he needed an assistance with all the future project that he will undertake.