When I shoot 120 I oftentimes finish the roll immediately (within a few hours), but with 35mm I tend to leave it in my camera for much longer (2-3 weeks). I use the two mediums differently and so I wanted to know if I can generally get away with this using 120 cameras.

I ask because film flatness issues are oftentimes brought up in the context of 120 cameras, but not so much with 35mm cameras. To be fair, I'm oftentimes attracted to folders and those designs are inherently more problematic.

If the camera matters then I am thinking about smallish/compact 120 folders/rangefinders: Fuji GS645, Fuji GF670, Plaubel Makina, Mamiya 6.