It took me about 3 hours. I did a bunch of research and I found out that you can delete the intermediate folder in the engine directory however, this will lead to re-compiling the engine from scratch if you change anything within the engine and it will take a lot of time.
There is also a bunch of pdb files generated that are only useful for debugging purposes that can be safely deleted.
The biggest confusion to me is plugins folder which is 66 GB. It seems very off but I have not found anything relevant to it.