Here's a formula that puts you in the correct range for Fuji's data sheet on Acros with full strength Xtol:
developing time in minutes = a * degrees Celsius ^ b
where a = 2148.484
and b = -1.872
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for dilutions of
1:1 multiply time by 1.3
1:2 multiply time by 1.6
1:3 multiply time by 1.9
These are based on Kodak's
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