People experience reality based on how they see the world. If your brain chemistry is off, you see it different from other folks. It is all chemistry. On top of this, if there is not any insight by the afflicted individual into the wrongfulness of their actions, there is little change that will occur. You really cannot do much other than to hold your ground.
Answer is it depends.
It can be anywhere from soon to never. Again, if the behaviors are not perceived of as being wrong, they will not change. This revolves around the same answer as in 1. It is a lot like democrats versus republicans. Your husband is like that.