How important is double bath fixing? If you are selling prints it would seem your clients should reasonably expect your print to last multiple decades without significant deterioration if displayed or stored under reasonable conditions. Two bath fixing should be part of your process. Then again, if you are printing for your own enjoyment do you really care if a print lasts 30, 50 or 100 years? How long are you going display a print before you decide a change is due? How much trouble would it be to reprint an image after, say 15 years? If you are printing for the joy of it, as I do, I vote for single bath fixing taking care not to over use the fix followed by a sensible washing routine.