Well I'm going to loose my Pyro virginity tonight. A local photographer gave me two little bottles of solution A and B for PyroCat HD and 6 4x5 hangers. Gee now I get to develop my own LF negs! I'm so excited.

Ok here is my question. I have exposed my HP5 negs at the full 400asa rating, placing the shadows on Zone IV ish. Without getting into all the testing crap that I haven't obviously done (but will do) what do the learned developers here recommend for a starting developing time? Also the only fixer I have is the usual Ilford stuff which I think has a hardner. Is this a problem?

My searching kind of has me leaning to around 13 minutes, but I could be wrong (I often am).