Emulsion stripped off? Is that battery acid fixer you are using?
Originally Posted by HumbleP
I just took some hypo+ammonium sulfate fixer I mixed a LONG time ago. A snip of color film didn't change significantly in an hour of bath. I then tried some B&W, and although I was busy and not watching the clock, it certainly cleared up in less than 15 minutes. Coulda been three. Or a tiny fraction thereof.
If you are bent on using hypo, I guess you will have to do your own testing. If you looked at the material in the links I provided, you should be able to narrow things down somewhat. Since it's hard to overfix, consider time to be the price of sticking with hypo.