Problem building UE4 from source

Hello! I am having problem with building UE4 from source. I cloned and did all the steps except I am having a problem when I have to build the engine. I cloned the whole thing into my D drive. And the build is really slow. It takes 1 or 2 hours and it is just done with like 100/2000. But when I cloned that in my C drive it used to work quickly but my C drive is very small and I used to be almost out of storage. Any helps would be great!