Originally Posted by Murray Kelly
Try the times for HC-110. Experiment from there if not satisfied. It's a very similar developer to DDX.
HC-110 (B) is usually 2-4 minutes LESS than DD-X
So using HC-110 times isn't what I would advise... But maybe 3 minutes longer than HC-110(B) times. Which is probably 9 minutes for a 100 speed film.