I am running a quad-core workstation.
The only issue is if you enable virtual texture or fog in the settings, it will recompile shaders, mine took 2 hrs to compile.
You need more cores to compile shaders fast.
Though I do not recommend 3D work ( you will not be using only unreal but 3D software as well) to be done on a laptop.
If you are looking for a long-term setup go for an assembled workstation.
Why you can check out one of my quora answers here, it applies to game dev and 3D works as well.