Response to 35mm and 120 different dev times.

Since there's the same amount of emulsion, roughly, in 36 exposures of 35mm as in a roll of 120, could there be developer exhaustion to account for the differing processing times? I can develop 4 rolls of 35mm or 2 rolls of 120 in the same tank so there's twice as much emulsion to develop. (This is an academic consideration for me. I never use 35mm.)

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