Law

I started the preliminary interview process with a large law firm in the beginning of January. I met with a chief People officer and the chief operating officer after which they referred me to the Practice chair for an interview. After meeting with the Practice chair, they asked me to set up interviews with the remaining keep offering officers as well as four partners after that portion of interviews. I was asked to come into the office for four days to meet with additional partners and a few that I had already met with virtually but this time in person, I was also asked to prepare a presentation on a 90 day plan for the first two people that I interviewed with after that I was asked to come in and present the same to the Practice chair and Co-Chair. I have never experienced an interview process like this. My final interaction with them was on February 28 and I haven’t heard anything since then. Is this common in a large wall firm? Are they ghosting me? Does it just take longer for them to issue an offer?