Come on time but not earlier. By federal and state law, you are not allowed in any room alone were a computer is networked. Plan for three hours regardless of skill level or length of time spent on prior phone screens. The interview is also used to gage the type of work they can give you. Do not plan on quick response. The president must approve every hire. Not even the VP (who is son) can expedite requests for hire. The president typically interviews every potential hire. He has also been known to out right refuse hire regardless of qualifications. He has also alright granted an offer in the same week. Sometimes an offer can take months even a year to be delivered. Program and development manager conducts interview. Interview will be uncomfortable. They are looking for dedicated candidates who intend to work long term and weed out those looking to skip out after a few years. Old school courtesy goes a long way. Followup with a formal thank you email and pick items brought up in interview to demonstrate your earnest interest in the position.