First, talk to HR. Second, talk to the manager. Third, approximate four hours of the interview. Never set the interview time when almost near the end of the day otherwise the last person would feel impatient and want to end the interview.

I did two interviews on the phone with two of their global offices, one on-site in Santa Clara and even though they told me the feedback was very positive, they finally ghosted me without an official rejection. Waste of time and very bad impression.