I think you're supposed to remove the shells first.

I think people may not realize how easy it is. Or maybe a food processor isn’t a common item in every household. I only bought one last year, prior to that I was making peanut butter with a hand blender and that was a pain.

It varies. Sometimes I use salted peanuts, other times plain.

Yeah, I use roasted peanuts and cashews, and they keep fine. Make peanut and cachew butter in two and a half cup batches in the food processor, which comes out to about half that once made into butter.

I don't know how long it takes to go through, probably a few weeks each. I've never had any go bad.