FASTBuild has been a game changer for our team recently if you have extra hardware sitting around.

https://www.fastbuild.org/docs/home.html

Your org needs better distributed build caching if you can't get that number lower. All builds should be "incremental" with appropriate caching.

Not everyone in the world who compiles a C++ project is necessarily doing so for an "org"

It does if you have an even remotely reasonably specced development machine.