Last summer I was shooting 50-60 rolls a month, about half was 120. Problem for me is that I have a lot of gear and I often carry two MF cameras to go out shooting to exercise myself and my gear.
I own a Zeiss Ikon Super Ikonta, Rollie Whiteface 3.5F, Plaubel 69W, Pentax 67II, Fuji GL690, and a GM670.
In small format I shoot Nikon F3's and a pair of Leica M's (Wetzlar M6 and M4).
In my past I use to mix up 20 liters of ID-11 each month until I switched to Diafine. Just know that for the past 5 years I've just concentrated on making good negatives for wet printing with no printing to concentrate on just image capture, and I don't scan. BTW this annoys many people, but I learned a lot, and my photography made a big leap forward. I figure now is the time to shoot as much as possible so that I have no regrets in the future. I figured if I want to become a good shooter I'd better shoot as much as I can, even if this means not printing.
Recently I bought a Monochrom, but to justify having all this great gear I actually use all of it heavily.
Cal