Had an initial interview then a week to do a design challenge. The design challenge took about 30+ hours for me to complete, but I was sent out to HQ to present my challenge and other work in front of a group of designers. I had lunch in their cafeteria (which was delicious) and then three rounds of interviews with designers. Ultimately, I didn't get the job for reasons that I agreed/disagreed with, but I can't really complain. My one qualm is that in the process of getting reimbursed for my expenses, the problems I ran into took several days to be addressed.