I had 2 interviews, both over the phone. They were really accommodating because I was in a different state at the time (while at school). The first phone call took place in November and was about 20 minutes long with an HR recruiter. The second and final round was a video Skype interview and took place in December. It was with 3 employees in the department I was applying for and lasted about an hour. Read the interview questions on glassdoor and google common behavioral interview questions!