I'm not completely sure why the build time is so long, but I have a few guesses. I think that Chromium is compiling for many many different platforms when it builds which would explain the huge required space. In addition it is compiling all of its dependencies along with it, instead of linking them like so many other libraries do. And the 3rd thing is that my computer is not that fast.
I created this with the idea of having a inexpensive alternative to the other options I saw that are relatively expensive (PAW). I wanted an option that was a little cheaper, but still had many of the features. It supports many more features then the other options in the price range. Like a wider variety of HTTP Methods, or the ability to use templates for custom data modeling.
My email is me@sphw.io