I don't think the "reveal" scene is rushed because they had no time to make it longuer. It's just that the audience already knows the truth and does not share Han's surprise. So it would be pointless from a storytelling point of view to spend more minutes of Han getting shocked, asking questions etc...
It's just a scene that needed to be shot because Han needed to know the truth (for the movie to end "properly"), but not really the audience.