Our fastest platform takes about 20 minutes to compile on a fast system (often down to about 30 seconds for incremental builds, and less if you do something fun

Our fastest platform takes about 20 minutes to compile on a fast system (often down to about 30 seconds for incremental builds, and less if you do something fun like building in a RAM disk). On the same system, our slowest platform takes about an hour and a half (some different plugins are built, but mostly that platform just has a slow compiler). Later stages of the build have the outputs of previous stages as prerequisites. I wouldn't put build speed above maintainability, but build speed can still be a problem for large projects.