Sqlite3 select range of bytes\chars from blob -

I have hex drift line 12582912 bytes. I need a selection of bytes from this row category

I have tried:

  select substr (hex (line), 1, 5242880) from where id = id;  

where 1 byte starts, and 5424880 - the end byte works, but it is slow

whether to get several bytes from Hex Blob in the satellite Are there other ways?