4 rounds in total. 1st was a half hour interview with the UX Manager. Later she scheduled all 3 interviews at a time in the following week. 2nd round was 1hour with Design team. 3rd round was with Human Factors. 4th round was with Product Owners. I think based on each interview round feedback it is best to schedule another round only if they get positive feedback from that interview. Such a waste of time and energy to prepare and spend time for all those interviews when they are not even interested in you.