One interview - never heard anything again. I had an informal 30 minute phone interview around Thanksgiving and then was told I would hear one way or the other and crickets.

4 stages - virtual interview with CHRO 30 min, case study 1 week, virtual interview with Research Director 40-60min, face to face interview with Consultants. Communication was good, I was informed at every stage about the progress and never left wondering about the status of my application. The CHRO made it a point to check in after the 3rd stage, which was a surprise but definitely boosted the candidate experience. But I found some questions at the 3rd stage contentious and also wasn't given a chance to explain my case study response.