I think it varies according to the individual. I've read anywhere from 1000mg to 3000mg. Of course, this is not what you would do if you were doing a low sodium diet. For low sodium I've heard as low as 500mg.
If you're not having water retention problems or medical problems associated with sodium (like high blood pressure) I wouldn't worry about cutting sodium...I would just do what your doing and be conscious of it and not add it to anything. One teaspoon is like 2300mg.