The problem is not the quantity of film, rather the drain times.
For example if you use a Paterson single 120 reel tank, it will empty in much less time a 4-reeler.
That is where you are going to get a variation.
However, if you use several tanks you can "dip and dunk" the reels into each chemical bath.
I have done this myself using some ABS tubes for "tanks".
I put up to 10 rolls on a homemade lift rod, dip it into the developer tube, agitate by lifting up and down.
Then when timer rings, lift out and dunk into tube full of stop bath, then fix, etc.
Works flawlessly every time, you just have to do it in total darkness.
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