Here you go,

All you need to know about chemistry, and you have to consider deterioration when in a tray. See page 3 for the recommended capacity.

Using it one shot in drums, I can get 3 8x10 per 70 ml by reusing the 70 ml for a couple 8x10 and 4 4x5 test prints, that is 6 trips thru the drum for the same 70 ml in a couple of hours. Which turns out to be 42 prints per liter.