The capacity of the C-41 process as published by Kodak is 60 rolls of 35mm 24 exposure per gallon. This works out to about 12 rolls per liter. In other words, if the solution is fresh and you wish to process 100 rolls at the same time, the volume needed can be calculated as 100 ÷ 12 = 8.3 (8.3 liters).
Under batch processing conditions, if you are not replenishing the solutions, you must compensate for loss of potency by increasing the time in solution or temperature or both. Because I think the C-41 recipe is about the same for all products, it is my belief that you can follow the chart previously used.
Now for the rest of the story: The developer is a selective reducing agent with the ability to identify exposed vs. unexposed silver salt crystals. Upon identifying exposed light sensitive silver salt crystals, it reduces them ignoring the unexposed crystals. The developing action (reduction) splits exposed crystals into their two component parts. The halogen component is dissolved away into the waters of the developer. The silver component, now metallic silver, is embedded into the emulsion. This flake of metallic silver comprises the foundation of the photographic image.
The halogen component of the crystal is bromine and it is present in the fresh unused C-41 developer solution. The halogen component acts as a restrainer in that it assists the developer as to its ability to differentiate between exposed vs. unexposed crystals. As development continues, more and more restrainer will be liberated adding to the bromine count in the developer solution. This added restrainer plus other spent developer components requires that we add time or elevate temperate or both maintain proper developer action.
Best if we add a developer replenisher. This is a special developer formulation used to maintain the developer’s potency indefinitely. A developer replenisher is a modified formula with the restrainer omitted. We meter a replenisher solution into the working developer solution at a specific rate. This rejuvenates the tank formula and proper activity is maintained as more and more rolls are developed.