I was an out of state applicant so I had a 45 minute phone interview first then was scheduled for an on-site interview. The interview lasted two hours! 45 minutes to an hour were spent in the formal interview and meeting people I would be working under if hired. The remaining time was spent on a tour of the lab and a written technical/theoretical exam. I was not prepared for the test but was told before I started it that nobody ever knows all the answers.