I've actually never heard of a full time illustration position? what kind of work would you be doing? is it educational/textbooks? do they retain all the rights to the work? do you have to keep it secret? that might factor into how much you'd want to be paid also.
Also since none of us have been particularly helpful about the actual question maybe you should pose it to the next 3PP live stream. If you're not a patron I could ask it on your behalf if you wanted.