The fixer would stop the developer. Without the stop bath first, the fixer does not last as long. The stop bath after accomplishes nothing and gets rinsed out with the washing. Just one of those survivable mistakes. Now if you used the fixer first followed by the developer, it would not have been so good!
When you say "does not last as long" what do you mean?
The Important Ones - Mamiya: 7 II, RZ67 Pro II / Canon: 1V, AE-1 / Kodak: No 1 Pocket Autographic, No 1A Pocket Autographic
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~Stone | "...of course, that's just my opinion. I could be wrong."~Dennis Miller