Well, I would likely cross process it just goofing around. I don't shoot for money and I carry a camera with me every day anyways. I don't develop myself and my local lab only chargs $4/roll anyways, so time isn't my concern.
I just wasn't sure if there was a limit to the amount of time film can be frozen and still viable. I dont expect it to be perfect, but still shootable. Curious though, what would film this old be worth? I'm mainly interestd in the 135.