It was of one hour. The asked about experience , skills and what are the expectation. Then they switched towards the design questions. And how one will test the design.

Submitted my resume, got a call from recruiter that asked about my experiences, then had an interview with the manager within a week. The interview was about 40 mins and talked about my academics, understood what the job is about. 2 hours after the interview, I was informed that I got hired.