Mine is about 2 inches and gets used almost daily how often should I clean it?
I always think it's good to clean your 'tobacco' pipe before every use. If you're using a clean 'tobacco' pipe then your 'tobacco' will flow much smoother and have a cleaner taste. Also remember to clean or replace the gauze frequently as the 'tobacco' particles can clog it up.
I know my grandfather cleans his at least once a day :)