I don't have a direct answer for you. Hopefully others will.

I use an automatic processor that holds 2.5 Liters for each step. I can process 35 8x10's before the chemistry is exhausted.
The chemistry kit you purchased may have a breakdown on the chemistry's capacity which you may then be able to break down further. (ml of chemistry per sq.inch of paper)
If the chemistry is even partially exhausted, you will know - the blacks will be dull and the colors will lack saturation.

I would also say that you shouldn't push your luck with the chemistry capacity: it is a false economy as any wasted paper is also expensive.