It was a day long session which is ok if it is told in advance. They called people from all technologies and made them wait in a common room without any inputs. After calling at 10, the first round of interview happened at 3 which was hardly a 5-10 min face to face round. The interviewer seemed inexperienced and was just deciding the outcome based on the overall experience rather than the knowledge of the candidate. So if you're planning to come, better to not go on time.