Hey Rudy,
so I have 2 projects in my project list inside UE4. I would say one project is a little bit more complex, because of amount of assets,shaders,maps etc. but it actually shouldn’t be that huge that it takes this long. Also I usually start UE4 first and later I select and load project from project list when window asks me if I want to create a new project or load an existing project. So it’s not a certain project what needs to load this long, it’s engine itself.
best regards