Pretty much. Things that make a wash more effective do not necessarily allow a shorter wash time. With double weight papers, the slow down in washing effectiveness after initial removal of hypo from the gelatine is pretty pronounced, and it takes time to get the thiosulfate out of the paper fibers. A one-hour wash, even without HCA, reduces the thiosulfate to generally acceptable levels. HCA can reduce the wash time some - see the instructions, but a one-hour wash is still a good guideline.
Originally Posted by Tom1956