Speeding up the build process

Is there an easy way to speed up the build process. Currently building the gateway requires 3 hours for me. I think most of the time is required for compilation (and installation) of the packages. There is a whonix_binary folder in the end with the final packages (I guess). Can I just copy this over to the folder of another build and the whonix build script will automatically detect that the final packages are already there, skip the compile step and just start the installation of the packages?

Please use the existing thread.