5 interviews for an internal candidate. Why so many with internal references? Folks were very nice but the process moved very slowly due to full calendars for the interviewers

I had 2 rounds of interviews. One with the hiring manager and other with a technical team. The approach was professional and mock questions were framed around the Responsibilities defined in the job description. There were no asks on flexibility to pick up other functions on ad hoc basis. Working at the same company now. Job is inline with the interview and job description provided.