Not terribly surprising. Back when I worked at MSFT, I spent ~3 months (and had two other developers and a couple of build engineers working with me) taking our

Not terribly surprising. Back when I worked at MSFT, I spent ~3 months (and had two other developers and a couple of build engineers working with me) taking our 3 _day_ build and getting it down to ~12 hours. But, that was several times larger than this system (even then), and it was about 7 years ago. And it had to support all sorts of weird things such as "which compiler do you use to build the compiler; the compiler you just built, the compiler you last used, or the compiler we last shipped?" for a very large configuration of compilers, runtime platforms, etc.