Too long and too much hassle for the offer that I finally got.
I had to do two IQ and personality tests and we had 3 in-person interviews that were mainly the same but with different people. In each of them we went slightly deeper into technical questions (really basic stuff) or into the company's structure and how to progress inside it, which was really good to know, but it would be better to just get an email with a PDF explaining everything so that you can review it later.
I think one quick remote interview and a second one in person is more than enough. Moreover, I was lucky to have some suits already at home, but I guess some people may not have appropriate clothing for the interview and won't be happy to have to buy one just for that, specially if we take into account how many IT companies have casual or relaxed dress code policies.
I finally got an offer but although it would be my first time into a cibersecurity role and I still had to finish the last subjects from my degree, I think it was too low taking into account that I did the Information Technologies specialisation with multiple honors and that I already had experience in another IT consultancy as a Junior/Mid Level Software Engineer.
At the end I rejected the offer as it was far way worst than what I already had: salary (fix and variable), perks, trainings, events, travels, location, dress code, schedule, flexibility to work from home and office atmosphere.
Deloitte may seem really appealing from outside, specially when you see all those people in their business suits, but unfortunately they don't offer anything better than other companies.