I use a Paterson tank system. The tank I most always use will hold two reels of 35mm film or one roll of 120 film.
For 35mm film I only develop one roll at a time. It works for me. With one 35mm roll, on the bottom of the Paterson tank it says use 290 ml of working solution. I usually use 300 as it’s easier to take 150 plus 150 if it is working solution of 1 to 1. Or, another way, 290 ml is 10 ounces. 5 plus 5.
I make photographs as a return ticket to a moment otherwise gone.