First rounds were conducted on campus on day one. First rounds consisted of one 30 minute interview. Some behavioral questions, but more focused on retail and actual business decisions.
Then second rounds were the second day. This consisted of two 30 minute interviews in a very similar format to the first day. Every interview started with "Why Amazon?". The interviews were mostly retail focused, although I was looking for a tech product management internship.
Decisions were given out on the 4th day. We were emailed decisions.