Yes, it's lengthy. Yes it's a commitment. But I was very grateful how helpful the recruiter was to make sure I was prepared. They want to ensure you are the best fit for the role, and not just if you "interview well". Having been on the other side of hiring people, I have hired candidates that interviewed well but performed poorly. I am confident Amazon's process avoids that more than most companies, and I appreciate that I would be working alongside fellow high-performers if I ever worked there.