Thanks. That is the number I would have guessed at. What strikes me as strange is that from the numbers I have seen, it looks as though the development times for FP4 and TMY are about the same throughout the SBRs. If that is so, it is a lucky coincidence (less for me to remember).
I have noticed that several films in pyrocat in a specific dilution will develop with reasonably similar times especially in BTZS tubes.