The interview process occurred 1 week after having set the appointment, and at that time, I was a high school' student, so it was my first work experience.
As I went inside a seven-floor building in which they had been holding interviews, I met one of the interviewers and he told me I would have waited a long time because of the number of people waiting for the interview.
Fortunately, I had not to wait so long, in fact, after about 45 minutes I went in and the interview started.
The interview process was not so long: it was all about picking up information of each potential candidate and then after a week they would have given the answer.
Generally, they were asking general question "to break ice" and then they came up with the main body of the interview asking candidates about more detailed questions.