The duo spent four weeks in November at the program.
The program resumes Jan. 13.
Terry Collins indicated at the winter meetings that Duda felt his quickness increased as a result of participating in the program.
"Each of the players is there for a different reason," Sandy Alderson said in November. "There's nothing punitive about it. It's really an opportunity."
2013 first-round pick Dominic Smith as well as Phillip Evans also are due to participate.