Amazon Manager Operations interview questions

I first got a call from HR of briefly asking my past experience, then she arranged the interview with the hiring manager during the call. Then I had an interview with the HM for the second round. The final round- talked to 5 interviewers back-to-back.

Initial phone screening, followed up a 4 hour interview process. 1 hour tour and 3 separate interviewers, all lasting about an hour. I received a call and an email 9 days later, saying they want to offer me a position. Then the HR contact said I would start mid-end of Februrary, when that time came and went I received an email saying they had no opening initially and I would start in March "sometime" there is 12 days left of the March sometime window. I liked the Company and everyone I talked with, but HR is not the focus and this is pretty standard from what I have heard.