Do you say that two bath fixing time is shorter than one? Could you please explain? What is your personal procedure?
Yes, two-bath fixing is shorter than one. Take your current one-bath fixing time and split it in half. Now fix sequentially for that time in two baths (where the 2nd is always fresh), and your print will have less residual thiosulfate than with the previous method, because the 2nd fix is always fresh. Consequently, you can fix for less time with two-bath fixing to get the same result.