Deutsche Bank interview questions

3 interviews, total 4 hours long. They rotate among different teams and with a manager director of research in London (video call). They are careful to describe the kind of job they want you to do and if you agree with the general objectives. They ask specifics about research projects and interests. They can go quite deep into technical details. You're also asked to describe in detail one of your papers. Some general knowledge about the current state of the economy is expected.

Worst interview experiance I ever had. It's technically still ongoing even though I have given up hope. I was approached by an agency for the opening and they had scheduled the interview. It was actually a walk in though. And they tested all applicants, even with more than 5 years of experience. Afterwards the HR told me that I had passed the test but they have no one to take in interview and thus he'll arrange for a telephonic interview. After this there was a gap of almost a month in which I kept following up with agency. After this they asked me to appear in person again for the interview. Which I did and cleared as well. The interview was quite easy. The HR said that there will be a fitment round with some VP after that and thats the last communication I had with them. I followed up with the agency again for a few weeks but they have given up as well. The HR team is really bad with timely communication. What if I had been on notice period, how can they stretch the interview process for that long?