When building programs with user interfaces*, there are parts that cannot be tested formally with either types or automated tests, because they require a human to test how things "feel."
In that context, long compile times lengthen the build-evaluate feedback loop to a point that harms quality.
- also note that APIs are user interfaces. So this harms way more than just programs with GUIs.
@url: https://www.youtube.com/watch?v=dnz6y5U0tFs Here he find it normal to build 1M loc of scheme code in 16minutes. "respectable compile time" (It used to be 4min!)
@url: tool by Aras https://github.com/aras-p/ClangBuildAnalyzer
Article on chromium @url: https://randomascii.wordpress.com/2020/03/30/big-project-build-times-chromium/