Software Developer applicants have rated the interview process at Amazon with 3.5 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 33% positive. To compare, the company-average is 63.8% positive. This is according to Glassdoor user ratings.
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The process took 2 days. I interviewed at Amazon in Feb 2012
Interview
Consisted of four 45-minute interviews on campus. When I passed the first interview, I was notified about 10 hours later with my schedule for next three interviews. Each interviewer tried to ask two questions. The questions were purely technical. Very useful to know your algorithms and data structures extremely well.