Very long, no breaks for water or bathroom. I wasn't expecting a very long interview for a job that I was not hired for. They asked "google" type of questions and nothing related to the job. OHMS law was mentioned but in this field it's never used with the machines that are in this group. Found it a bit disrespectful that they were more concerned about book smarts and not how more experienced you are on tools. Hope they find that person who is book smart instead of a person who knows the culture and tools.