the department I work for consistently makes interviewees wait when they arrive for their appointment. usually saying they need to prepare. some people i see waiting for 20-30 minutes. i just think it really disrespectful to ask people to wait more that 5 minutes when you had a prescheduled time arranged. idk. how long of waiting before you would be offended and or leave?
for context i work for a hotel and the positions are entry level if that makes a difference. also I have noticed that if they have interviews for upper management positions those people rarely have to wait.