I can build the D compiler (500k lines?) Warts and all in a second in my machine - and that's code that's not particularly complicated, but not at all optimized for compile times realistically.
To be fair, due to the fact that DMD can't depend on phobos it doesn't use a lot of the features that end up making D compiles slow, like lambdas and deep metaprogramming. DMD is in a way one of the least representative examples of a large D project.