Good Evening, Andrew,
I assume the question above is directed to me, since I mentioned the 1:7 dilution.
For T-100 (35mm and 120) my basic time is 10 minutes, although I'll back off a minute or so when I shoot flash shots. I give a hair more exposure (1/2 stop or so) then and use about 9 minutes. For sheet film, I use a Chomega drum on a motor base (continuous agitation) and usually go with 9 or 9 1/2 minutes for "normal" negatives, with adjustment up or down depending on the scene contrast. This is with the regular, not the RS, T-Max.
Konical