I develop my film in BTZS type tubes with minimal agitation. That means that I have a large volume of developer in an 8X10 tube. My experience indicates that I can develop 3 negatives with the same developer reused. This often amounts to over two hours of combined development time when I am developing a SBR 5 or SBR 6 negative. 10 oz of working solution Pyrocat at 1-1-100 will accomodate an 8X10 negative. The 1-1-150 (minimal agitation) and 2-2-100 Azo or Pt dilution should certainly have the same capacities. Hope that this answers your question.