Since I have some Pyrocat-HD to mix up, and have thought about using Rodinal 1:100 also - does semi-stand development work well with roll film (120)? Was considering initial agitation for 30 sec, then 10 sec every three minutes (using FP4+) for 30 minutes at 20 deg. - does that sound reasonable?

Would these times hold up for Pyrocat-HD as well?