most of the time pretend they re working and just bide their time till they can go home:)ADDED: well, administrative / secretarial work is usually quite boring and monotonous. Most office assistants deal w/ booking appointments, answering phones, filing paperwork, organizing files, running errands, making coffee, etc. Not worthed unless you re an executive:) Hope this answers your question!
Check out Dilbert comic strip for more info on this topic, it is more accurate than most answers you will get here.