The thing that takes the most amount of time I'm finding is mixing up all of the chemicals... since everything is one-shot, I can't reuse between batches, so I'm trying to load two 120 rolls onto the reel at a time - that has gone a bit easier than I was expecting actually. I use the Kodak recommended amount of solution (250mL per sq ft of film) to determine the amount for this combo, which is 312.5mL (90 sq in per 120 roll x 2).
I was adviced to run two rolls of 120 in 250mL .. But my slides turn up on the dark side (i run them at 7:15). Maybe 320mL will remedy that?