For anyone who wants to do this, use Kill Windows Update. It's simple. and it works. There's several million reasons why conventional wisdom demands that you NOT do it, but I don't give a fuck and if you don't either, then this program is for you.
Updates patch major security vulnerabilities. It’s cute that you think nuclear secrets existing in your hard drive are the only reason why you should care if your PC is infected with malware but it isn’t. Malware can steal your keystrokes, granting attackers access to your bank accounts and every other place you sign into online. Malware also uses background processes to do bad things, so your “multi-day” processes will take even longer when your computers resources are being hogged by nasty stuff.
A machine sitting there quietly crunching numbers isn't going to get infected unless your firewall is wide open, and if it is then correcting that is far more important than installing the latest Windows updates