Time allotment for Black Hills/Yellowstone/Grand Tetons

Search this Forum for each of those locations to get an idea of how much time posters have spent there.
Black Hills is worth two days. Take the bus tours of Rushmore and Crazy Horse and a separate tour for the Badlands.
Suggest four days in Yellowstone including two bus tours.
A couple of days in the Grand Tetons should be enough if you don't hike.