How many programmers realistically would it take to make a high end game in UE4?

[JeDeergab]

@VagrantHumbao;232821

RPG with online Features. (and offline)

If you outline what each programmer would be doing, and if it was possible doing it all in one language (C++) or if it required more.

Aside from the programmers, and a 3d modeler, would anyone else be required?

Any details would be helpful - this post is business related for a friend.

You can have one programmer, one 3D modeller/animator, and designer to make a game excluding sound effects, musics, graphics, etc… because you can do it after the first BETA project is completed.