Calling fellow parishoners of the Church of Rodinal,
I'm about to soup a 120 roll of 400TriX in Rodinal 1:100. What development times have people had success with?
Try 20 min. at 20C. This is a recommended time at unblinkingeye.com.
I've downloaded and printed out the times from Massive Dev. Chart and unblinkingeye.com and put them in a 3-ring notebook. That way I always have times/temps/dev combos when I need them.